Frank solutions for केमिस्ट्री पार्ट २ अंग्रेजी] कक्षा १० आईएससी chapter 1 - Periodic Properties and Variations of Properties: Physical and Chemical [Latest edition]

What is modern periodic law?

How many groups and periods are there in the modern periodic table?

What is meant by periodicity of elements?

In terms of electronic configuration, what the elements of a given period and groups have in common?

Why is the electron affinity of fluorine less than chlorine?

Among the elements of the second period, Li to Ne, pick out the element with highest first ionization energy

Among the elements of the second period, Li to Ne, pick out the element with the highest electro negativity

Among the elements of the second period, Li to Ne, pick out the element with the largest atomic size

Among the elements of the second period, Li to Ne, pick out the element that is the most reactive non-metal

Among the elements of the second period, Li to Ne, pick out the element that is the most reactive metal

The change in the properties of elements on moving from left to right across a period of the periodic table. For the property, choose the correct answer.

The non-metallic character of the elements:

For the main group of the periodic table, the metallic properties of the elements vary approximately with their position as shown in the table.

Will the most metallic element be found at A,B,C or D ?

For the main group of the periodic table, the metallic properties of the elements vary approximately with their position as shown in the table.

Will the most non-metallic element be found at A,B,C or D ?

A, B, C are three elements in which B is an inert gas other than helium.With this information complete the following table.

Also, explain the following : Electron affinity of element A is more than that that of element C.

A, B, C are three elements in which B is an inert gas other than helium.With this information complete the following table.

Also, explain the following : Ionization energy of element C is less than that of element A.

A, B, C are three elements in which B is an inert gas other than helium.With this information complete the following table.

Also, explain the following : Electron affinity of B is Zero.

Fill in the blank
There are ______ groups and ______ periods in the modern form of periodic table. 

Fill in the blank 
Most electropositive elements belong to ______ group.

Fill in the blank
Most electronegative elements belong to ______ group.

Fill in the blank
Energy released when electron is added to a neutral gaseous atom is called ______.

Fill in the blanks.
Size of the atoms ______ from left to right across a period and ______ on descending in a group of normal elements.

Fill in the blank
The maximum electro negativity is shown by ______.

Fill in the blank
Noble gases have ______ electron affinity.

Fill in the blank
Oxidising property ________from fluroine to iodine because the power to accpet electron decreases.

Fill in the blank
Reactivity ______ down the gruop for alkali metals with increase in electropositive character

Fill in the blank
The nature of oxide Al₂O₃ is ____

State whether the following statement is true or false
Similar electronic configuration is repeated after intervals of 2, 8, 8, 18 and 32.

State whether the following statement is true or false
Al₂O₃ is an amphoteric oxide.

State whether the following statement is true or false
On moving horizontally across a period, number of valence electrons increases from one to eight.

State whether the following statement is true or false
All members of zero group are non metals.

State whether the following statement is true or false
The elements with higher electron affinity have higher ionization potential.

Arrange the following in increasing order of property indicated
Li, Be, B (ionization energy)

Arrange the following in increasing order of property indicated
F, Cl, Br, I (electron affinity)

Arrange the following in increasing order of property indicated
SiO₂, P₂O₅, SO₃, Cl₂O₇ (acidic nature)

Arrange the following in increasing order of property indicated
 I, I⁺, I^- (atomic size)

Explain, the statement 'In each period, the atomic radii gradually decrease with increase in atomic number'. Give one example to justify your answer.

How could the atomic radius of a noble gas be compared with the other elements in a period?

'In a group, the atomic radii increase with increasing period number', explain this statement and justify it with reference to group 17.

In the third period, which is the most metallic and most non-metallic element?

What is meant by ionization potential?

In a group, a particular element has the lowest ionization potential; does it ionize most easily or least easily? Explain with example.

What is electron affinity?

Electron affinities of two elements A and B are given below:
A = 3.79 electron volts
B = 3.56 electron volts
Which of them will ionize more easily and why?

Explain
Larger the atomic size, more metallic is the element.

Explain
Halogens have high electron affinity.

Explain
Size of atom changes when it loses or gain electron

Explain
K is more reactive than Li.

Explain
Electronegativity of Cl is higher than S.

Explain
Group 17 elements are non-metals, while group 1 elements are metals.

Select the correct answer
Which of the following electronic structure is of a metal?

Select the correct answer
Atomic radii of fluorine and neon in angstrom unit are

Select the correct answer
Configuration of an element is 2, 8, 1. Which of the following statement is true?

Select the correct answer
Which of the following element has highest electronegativity?

Select the correct answer
Number of shells in potassium are

Select the correct answer
Most reactive character among the elements given below is found in

Select the correct answer
Identify the metalloid

State the number of elements in period 1, period 2 and period 3 of the periodic table.

Name the elements in period 1.

What happens to the atomic size of elements on moving from left to right in a period?

What is the common feature of electronic configurations of the elements at the end of period 2 and period 3?

If an element is in group 7 is it likely to be metallic or non metallic in character?

Supply the missing word from the words given in brackets.
If an element has one electron in its outermost energy level, then it is likely to be _ (metallic, non metallic)

The properties of the elements are a periodic function of their __________.

Moving across a ______ of the Periodic table, the elements show increasing ______ character.

Copy and complete the following sentence choosing the correct word or words from those given below, at the end of the sentence:
The element at the bottom of a group would be expected to show ______ metallic character than the element at the top.

Copy and complete the following sentence choosing the correct word or words from those given below, at the end of the sentence:
The similarities in the properties of elements belonging to a group are because they have the same ______ 

What is meant by a group in the periodic table?

Within a group, where would you expect to find the element with the greatest metallic character.

State whether the ionization potential increases or decreases on going down a group.

How many elements are there in period 2?

The following table represents the first period of the modern periodic table. Study the table and answer the questions that follow:

1. Write the formula of the sulphate of the element with atomic number 13.
2. What type of bonding will be present in the oxide of the element with atomic number 1?
3. Which feature of the atomic structure accounts for the similarities in the chemical properties of the elements in group VIIA of the periodic table?
4. Name the element which has the highest ionization potential.
5. How many electrons are present in the valence shell of the element with atomic number 18?
6. What is the name given to the energy released, when an atom in its isolated gaseous state accepts an electron to form an anion?
7. What is the electronic configuration of the element in the third period which gains one electron to become an anion?
8. Fill in the blanks:
   The atomic size ______ as we move from left to right across the period, because the ______ increases, but the ______ remains the same.

The electro negativities (according to Pauling) of the elements in period 3 of the periodic table are as follows.
The elements are arranged in alphabetical order:
  Al     Cl     Mg      Na      P        S       Si
 1.5     3.0     1.2      0.9     2.1      2.5    1.8
(i) Arrange the elements in the order in which they occur in the periodic table  from left to right.
(The group 1 elements first, followed by the group 2 element and so on, up to group 7)

(ii) Choose the word or phrase from the brackets which correctly completes each of the following statements:
(a) The element below sodium in the same group would be expected to have a ______ (lower/higher) electro negativity than sodium and the element above chlorine which would be expected to have a ______ (lower / higher) ionization potential than chlorine.
(b) On moving from left to right in a given period, the number of shells ______ (remains the same / decreases/ increases).
(c) On moving down a group, the number of valence electrons ______ (remains the same / increases/ decreases).

Parts (i) to (v) refer to changes in the properties of elements on moving from left to right across a period of the periodic table. For each property, choose the letter corresponding to the correct answer from the choices (a), (b), (c) and (d).
(i) The non metallic character of the elements:
(a) Decreases
(b) Increases
(c) Remains the same
(d) Depends on the period
(ii) The electro negativity
(a) Depends on the number of valence electrons
(b) Remains the same
(c) Decreases
(d) Increases
(iii) The ionization potential
(a) Goes up and down
(b) Decreases
(c) Increases
(d) Remains the same
(iv) The atomic size
(a) Decreases
(b) Increases
(c) Remains the same
(d) Sometimes increases and sometimes decreases
(v) The electron affinity of the elements in groups 1 to 7:
(a) Goes up and down
(b) Decreases and then increases
(c) Increases
(d) decreases

The elements of one short period of the periodic table are given below in order from left to right:
Li  Be  B  C  O  F Ne
(a) To which period do these elements belong?
(b) One element of this period is missing. Which is the missing element and where should it be placed?
(c) Place the three elements, fluorine, beryllium and nitrogen, in the order of increasing electro negativity.
(d) Which one of the above elements belongs to the halogen series?

A group of elements in the periodic table is given below (Boron is the first member of the group and Thallium is the last). Answer the following question in relation to the given group of elements:

Which element has the most metallic character?

With reference to the variation of properties in the Periodic Table, which of the following is generally true?
Atomic size increases from left to right across a period.

With reference to the variation of properties in the Periodic Table, which of the following is generally true?
Ionization potential increases from left to right across a period.

With reference to the variation of properties in the Periodic Table, which of the following is generally true?
Electro negativity increases going down a group.

With reference to the variation of properties in the Periodic Table, which of the following is generally true?
Electron affinity increases going down a group.

The following questions refer to the Periodic Table.
Name the first and last element in period 2.

The following questions refer to the Periodic Table.
What happens to the atomic size of elements moving from top to bottom of a group?

The following questions refer to the Periodic Table.
Which of the elements has the greatest electron affinity among the halogens?

The following questions refer to the Periodic Table.
What is the common feature of the electronic configurations of the elements in group 7?

Supply the missing word from those in the brackets:
If an element has a low ionization energy then it is likely to be ______ (metallic/ non-metallic).

Supply the missing word from those in the brackets:
If an element has seven electrons in its outermost shell then it is likely to have the ______ (largest/ smallest) atomic size among all the elements in the same period.

The metals of group 2 from top to bottom are: Be, Mg, Ca, Sr, Ba. Which of these metals will form ions most readily and why?

What property of an element is measured by electro negativity?

Choose the correct answer:
Among the period 2 elements the one which has high electron affinity is

Consider the section of the periodic table given below :

With reference to the table, answer the following :
(i) Which is the most electro negative ?
(ii) How many valence electrons are present in G ?
(iii) Write the formula of the compound between B and H ?
(iv) In the compound between F and J, what type of bond will be formed ?
(v) Draw the electron dot structure for  the compound formed between C and K.

Atomic number of an element is 16. State

1. the period to which it belongs
2. the number of valence electrons
3. whether it is a metal or non-metal

Give reasons as to why the oxidising power of elements increases on moving from left to right along a period in periodic table.

Give the number of the group and the period of elements having three shells with three electrons in valence shell.

Fill in the blank from the choices given below
Across a period, the ionisation potential ____________.

Down the group, electron affinity ______.

Choose the correct answer from the choice given:
In the periodic table, alkali metals are placed in the group __________

Which of the following properties do not match with elements of the halogen family?

Among the Period 2 elements, the element which has high electron affinity is

Identify the metallic oxide which is amphoteric in nature.

which element has the highest ionisation potential.

In the above table, H does not represent hydrogen.Some elements are given in their own symbol and position in the periodic table while others are shown with a letter. With refrence to the table answer the following questions.
1. Identify the most electronegative element.
2. Identify the most reactive element of Group I.
3. Identify the element from Period 3 with least atomic size.
4. How many valence electrons are present in Q?
5. Which element from group 2 would have the least ionisation energy?
6. Identify the noble gas of the fourth period.
7. In the compound between A and H, what type of bond would be formed and give its molecular formula.

Choose the correct answer from the choice given:
Ionisation potential increases over a period from left to right because the

Choose the correct answer from the choice given:
An element A belonging to Period 3 and Group II will have

An  element Z has atomic number 16. Answer the following
(a) State the period and group to which Z belongs
(b) Is Z a metal or a non-metal?
(c) State the formula between Z and hydrogen. 
(d) what kind of a compund is this?

Among the elements given below, the element with the least electronegativity is:

The metals of Group 2 from top to bottom are Be, Mg, Ca, Sr and Ba. Which one of these elements will form ions most readily and why?

The metals of Group 2 from top to bottom are Be, Mg, Ca, Sr and Ba. State the common feature in the electronic configuration.

Arrange the following as per instruction given in the bracket.
Cs, Na, Li, K, Rb (decreasing electronegativity)

Arrange the following as per the instruction given in the bracket.
Mg, Cl, Na, S, Si (increasing order of atomic size)

Arrange the following as per instruction given in the bracket.
Na, K, Cl, S, Si (increasing ionisation potential)

Arrange the following as per instruction given in the bracket.
Cl, F, Br, I (increasing electron affinity)

Choose the most appropriate answer from the following list of oxides which fit the description.

A basic oxide.

Choose the most appropriate answer from the following list of oxides which fit the description.

An oxide which dissolves in water forming an acid.

Choose the most appropriate answer from the following list of oxides which fit the description.

An amphoteric oxide.

Choose the most appropriate answer from the following list of oxides which fit the description.
An amphoteric oxide: Al₂O₃ (shows both acidic and basic properties)

Rewrite the following sentence by using the correct > (greater than) or < (less than) in the blank given 
The ionization potential of potassium is _______ that of sodium.

Rewrite the following sentence by using the correct > (greater than) or < (less than) in the blank given :
The electronegativity of iodine is ________ that of chlorine.

Use the letters only written in the Periodic Table given below to answer the questions that follow:

(a) State the number of valence electrons in the atom J.(b) Which element shown forms ions with a single negative charge?
(c) Which Metallic element is more reactive than R?
(d) Which element has its electrons arranged in four shells?

Fill in the blank by selecting the correct word from the option.
If an element has a low ionization energy then it is likely to be ________ 

Fill in the blank by selecting the correct word from the bracket.
If an element has seven electrons in its outermost shell then it is likely to have the _____ atomic size among all the elements in the same period.

Fill in the blank from the choice given in bracket.
The energy required to remove on electron from a natural isolated gaseous atom and convert it into a positively charged gaseous ion is called ____________

Arrange the following as per the instruction given in the bracket
He,Ar,Ne (Increasing order of the number of electron shells)

Arrange the following as per the instruction given in the bracket
Na,Li,K (Increasing ionization energy)

Arrange the following as per the instruction given in the bracket
F,Cl,Br (Increasing electronegativity)

Arrange the following as per the instruction given in the bracket
Na, K, Li (Increasing atomic size)

Match the atomic number with the following:

A metal of valency one.