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# Selina solutions for Class 10 Chemistry chapter 1 - Periodic Table, Periodic Properties and Variations of Properties

## Chapter 1: Periodic Table, Periodic Properties and Variations of Properties

#### Chapter 1: Periodic Table, Periodic Properties and Variations of Properties solutions [Page 0]

State modern periodic law. Name the scientist who stated the law ?

What is a periodic table? How many groups and periods does modern periodic table have?

Why sodium element of group 1 and chlorine element of group 17 both have valency 1?

What are horizontal rows and vertical columns in a periodic table known as?

Periodicity is observed due to the similar ………………….

How does the electronic configuration in atoms change

(i) in a period from left to right?

How does the electronic configuration in atoms change

(ii) in a group top to bottom?

Correct the statements.

Elements in the same periods have equal valency.

Correct the statements.

Valency depends upon the number of shells in an atom.

Correct the statements.

Copper and zinc are representative elements.

Correct the statements.

Transition elements are placed at extreme right of the periodic table.

Name two elements in each case:

Alkali metals :-

Name two elements in each case:

Akaline earth metals :-

Name two elements in each case:

halogens :-

Name two elements in each case:

Inert gas :-

Name two elements in each case:

Transition element :-

Name two elements in each case:

Lanthanides :-

Name two elements in each case:

Actinides :-

What do you understand by?

Periodicity

What do you understand by?

Typical elements:

What do you understand by?

Orbits :

Why are noble gases placed in a separate group?

Name two elements you would expect to show chemical reactions similar to calcium. What is the basis of your choice?

Name the metal(s) and non-metals in the first twenty elements.

Metals:

Non-metals:

Name the type of elements .

Outermost shell complete – ....................

Name the type of elements .

Outermost shell incomplete – ………………

Name the type of elements .

two outermost shell incomplete – ………………

Name the type of elements .

one electron short of octet – ……………………

Name the type of elements .

two electrons in the outermost orbit - ……………

Name the type of elements .

two outermost shell incomplete – ………………

State its position in periodic table ?

Is is metal or non-metal?

State the name assigned to this group?

State the valency of the elements of periods 3 and write the formula of their oxides.

An element A has atomic number 14. To which period does this element belong and how many elements are there in this period.

Answer the following in respect of element 31/15 P

Give its electronic configuration :-

Answer the following in respect of element 31/15 P

To which group and period does it belong?

Answer the following in respect of element 31/15 P

What is its valency?

Answer the following in respect of element 31/15 P

Is it a metal or non - metal

Answer the following in respect of element 31/15 P

Is it a reducing agent or oxidizing agent?

Answer the following in respect of element 31/15 P

Give its formula with chlorine ?

#### Chapter 1: Periodic Table, Periodic Properties and Variations of Properties solutions [Page 0]

Name any five periods properties.

What do you understand by atomic size? State its unit ?

Give the trends in atomic size on moving:

down the group .

Give the trends in atomic size on moving:

across the period right to left.

Arrange the elements of second and third periods in increasing order of their atomic size.

Second Period .

Arrange the elements of second and third periods in increasing order of their atomic size.

Third Period.

Why is the size of

(i) neon greater than fluorine?

Why is the size of

(ii) sodium is greater than magnesium?

Which is greater in size?

an atom or a cation

Which is greater in size?

an atom or an anion

Which is greater in size?

Fe^(2+) or Fe^(3+)

Metallic character and non-metallic character are periodic properties discuss ?

Give the trend in metallic character:

(i) across the period left to right

Give the trend in metallic character:

down the group top to bottom.

State the trends in chemical reactivity:

(i) across the periods left to right

State the trends in chemical reactivity :

Down the group

State the trends in physical properties on moving down the group. Give an example to illustrate.

An element X belong to 4th period and 17th group, state.

no of valence electrons in it

An element X belong to 4th period and 17th group, state.

name of the element.

An element X belong to 4th period and 17th group, state.

name the family to which it belong.

An element X belong to 4th period and 17th group, state.

Write the formula of the compound formed when it reacts with (27)/(13) y

The given table shows elements with the same number of electrons in its valence shell.

 Elements A B C m.p. 63.0 180.0 97.0

(i) Whether these elements belong to same group or period.

(ii) Arrange them in order of increasing metallic character.

#### Chapter 1: Periodic Table, Periodic Properties and Variations of Properties solutions [Page 0]

Define the term ‘ionisation potential ?

Represent in the form of an equation. In which unit it is measured ?

What do you understand by successive ionization energies?

State the trends in ionization energy:

across the period:

State the trends in ionization energy:

down the group.

Name the elements with highest and lowest ionization energies.

Arrange the elements of second and third period in increasing order of ionization energy.

Define the term ‘electron affinity’.

Arrange the elements of second period in increasing order of their electron affinity. Name the elements which do not follow the trend in this period.

State the factors on which electron affinity depends ?

Electron affinity values generally _______ across the periods left to right and ______ down the group top to bottom.

Give reason:

Electron affinity of halogens is comparatively high ?

Give reason:

Electronegativity of chorine is higher than Sulphur?

Why fluorine has higher E.N. than chorine?

Define the term ‘Electronegativity’ state its unit.

Name the elements with highest and lowest electronegativity ?

State the character of the oxide of period 3 ?

Name the periodic property which relates to the:

Amount of energy required to remove an electron from an isolated gaseous atom,

Name the periodic property which relates to the:

character of element which loses one or more electrons when supplied with energy ?

Name the periodic property which relates to the:

tendency of an atom to attract the shared pair of electron ?

Group 17 elements are strong non-metals, while group 1 elements are strong metals ?

Metallic character of elements decreases from left to right in a period while it increases in moving down a group ?

Halogens have a high electron affinity ?

The reducing power of element increases down in the group while decreases in a period ?

Size of atom progressively becomes smaller when we move from sodium (Na) to chlorine (CI) in the third period of the periodic table ?

#### Chapter 1: Periodic Table, Periodic Properties and Variations of Properties solutions [Page 0]

How does the electronic configuration of an atom relate to its position in the modern periodic table?

Write the number of protons, neutrons and electronic configuration of 39/19K , 31/15 P.
Also state their position in periodic table.

Fluorine, chlorine and Bromine are put in one group on basis of their similar properties.

what are those similar properties?

What is the common name of this group or family?

What is the main characteristic of the last element in each period of the periodic table? What is the general name of such elements?

According to atomic structure, what determines which element will be the first and which will be the last in a period?

How does the number of:
valence electrons and

How does the number of:

valency vary on moving from left to right in the second period of the periodic table?

Fill in the blank:

(a) The horizontal rows in the periodic table are called …………

Fill in the blank:

On moving across a period from right to left in periodic table, the atomic size of the atom ……….

Fill in the blank:

on moving from right to left in the second period, the number of valence electrons……….

An element barium has atomic number 56. Look up its position in the periodic table and answer the following questions.

Is it a metal or a non – metal?

An element barium has atomic number 56. Look up its position in the periodic table and answer the following questions.

Is it more or less reactive than calcium?

An element barium has atomic number 56. Look up its position in the periodic table and answer the following questions.

What is its valency?

An element barium has atomic number 56. Look up its position in the periodic table and answer the following questions.

What will be the formula of its phosphate?

An element barium has atomic number 56. Look up its position in the periodic table and answer the following questions.

Is it larger or smaller than caesium (Cs)?

How do the following change on moving from left to right in a period of the periodic table?

atomic structure (electron arrangements) ?

How do the following change on moving from left to right in a period of the periodic table?

Chemical reactivity of elements ?

How do the following change on moving from left to right in a period of the periodic table?

Nature of oxides of the elements ?

This question refers to the elements of the periodic table with atomic number from 3 to 18. Some of the elements are shown by letters, but the letters are not the usual symbols of the elements.

 3 4 5 6 7 8 9 10 A B C D E F G H 11 12 13 14 15 16 17 18 I J K L M N O P

Which of these:
(a) have most electronegative element.
(b) is a halogen?
(c) is an alkali metal?
(d) is an element with valency 4?
(e) have least ionization energy?
(f) have least atomic size in period 3.

In group I of the periodic table, three elements X,Y and Z have ionic radii 1.33 A˚, 0.95 A˚ and 0.60 A˚ respectively. Giving a reason, arrange them in the order of increasing atomic number in the group.

How does the chemical reactivity of

alkali metals vary?

How does the chemical reactivity of:

halogens vary?

An element X belong to 3rd periods and group II of the periodic table state:

the number of valence electrons,

An element X belong to 3rd periods and group II of the periodic table state:

the valency,

An element X belong to 3rd periods and group II of the periodic table state:

name of the element,

An element X belong to 3rd periods and group II of the periodic table state:

whether it is a metal or a non-metal.

The electronic configuration of an element T IS 2, 8, 8, 1.

What is the group number of T?

The electronic configuration of an element T IS 2, 8, 8, 1.

What is the period number of T?

The electronic configuration of an element T IS 2, 8, 8, 1.

How many valence electrons are there in an atom of T?

The electronic configuration of an element T IS 2, 8, 8, 1.

What is the valency of T?

The electronic configuration of an element T IS 2, 8, 8, 1.

Is it a metal or a non-metal?

Arrange the Elements of Group 17 and Group 1 According to the Given Conditions.

Increasing order of atomic size,

Arrange the elements of group 17 and group 1 according to the given conditions.

Increasing non – metallic character

Arrange the elements of group 17 and group 1 according to the given conditions.

Increasing ionization potential

Arrange the elements of group 17 and group 1 according to the given conditions.

Increasing electron affinity

Arrange the elements of group 17 and group 1 according to the given conditions.

Increasing electron affinity

Arrange the elements of group 17 and group 1 according to the given conditions.

Decreasing electro negativity.

Complete the following sentences.

The properties of the elements are a periodic function of their …………… (atomic number, mass number, reative atomic mass).

Complete the following sentences

Moving across a ………….. of the periodic table the elements show increasing ………………..character (group, period, metallic, non-metallic).

Complete the following sentences

The elements at the bottom of a group would be expected to show …….. metallic character than the element at the top. (less, more).

Complete the following sentences

The similarities in the properties of a group of elements are because they have the same …………………

Give reasons for the following:

The size of the anion is greater than the size of the parent atom.

Give reasons for the following:

argon atom is bigger than chlorine atom.

Give reasons for the following:

Ionisation potential of the element increases across a period.

Which element has:

two shells, both of which are completely filled with electrons?

Which element has

the electronic configuration 2, 8, 3?

Which element has:

a total of three shells with five electrons in its valence shell?

Which element has:

a total of four shells with two electrons in its valence shell?

Which element has:

twice as many electrons in its second shell as in its first shell?

Name

An alkali metal in period 3 and halogen in period 2.

Name

The noble gas with 3 shells.

Name

The non-metals present in period 2 and metals in period 3.

Name

The element of period 3 with valency 4

Name

The element in period 3 which does not form oxide

Name

The element of lower nuclear charge out of Be and Mg.

Name

Which has higher E.A. fluorine or Neon

Name

Which has maximum metallic character Na, Li or K.

Chorine in the periodic table is surrounded by the elements with atomic number 9, 16, 18 and 35.

Which of these have physical and chemical properties resembling chlorine.

Chorine in the periodic table is surrounded by the elements with atomic number 9, 16, 18 and 35.

Which is more electronegative than chlorine

State the number of elements in periods 1, Periods 2, and Period 3, of the periodic table.

name the elements in period 1.

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

if an element is in group 17, it is likely to be ………….. (Metallic / non-metallic) in character while with one electron in its outermost energy level (shell), then it is likely to be ……………(Metallic / Non-metallic)

First ionization enthalpy of two elements X and Y are 500KJ mol-^1 and 375KJ mol-^1 respectively. Comment about their relative position in a group as well as in a period.

A metal M forms as oxide having the formula M_2O_3. It belongs to third period. Write the atomic number and valency of the metal.

Explain why are the following statements not correct:

All groups contain metals and non metals.

Explain why are the following statements not correct:

Atoms of elements in the same group have the same number of electron(s)

Explain why are the following statements not correct:

Non- metallic character decreases across a period with increase in atomic number

Explain why are the following statements not correct:

Reactivity increases with atomic number in a group as well as in a period.

Arrange the following in order of increasing radii:

(a) CI- , CI
(b) Mg^(2+), Mg, Mg^+
(c) N, O, P

Which element from the following has the highest ionization energy?

P, Na, CI

Which element from the following has the highest ionization energy?

F, O, Ne

Which element from the following has the highest ionization energy?

Ne, He, Ar

An element in period 3 whose electron affinity is zero

(i) Sulphur
(ii)Sodium
(iii) Neon
(iv) Argon

An alkaline earth metal

(ii) potassium
(iii) calcium
(iv) Copper

An element with highest ionization potential
(i) Calesium
(ii) Fluorine
(iii) Helium
(iv) Neon

## Selina solutions for Class 10 Chemistry chapter 1 - Periodic Table, Periodic Properties and Variations of Properties

Selina solutions for Class 10 Chemistry chapter 1 (Periodic Table, Periodic Properties and Variations of Properties) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the CISCE Selina ICSE Concise Chemistry for Class 10 solutions in a manner that help students grasp basic concepts better and faster.

Further, we at Shaalaa.com are providing such solutions so that students can prepare for written exams. Selina textbook solutions can be a core help for self-study and acts as a perfect self-help guidance for students.

Concepts covered in Class 10 Chemistry chapter 1 Periodic Table, Periodic Properties and Variations of Properties are Periodic Properties-chemical Reactivity, Relation Between Atomic Number for Light Elements (Proton Number) and Atomic Mass for Light Elements, Periodicity on the Basis of Atomic Number for Elements, Periodic Properties - Electronegativity, Periodic Properties - Electron Affinity, Periodic Properties - Ionisation Potential, Periodic Properties - Metallic Character, Periodic Properties - Atomic Size, Periodic Properties and Variations of Properties:- Physical and Chemical, Periodic Properties -physical Properties.

Using Selina Class 10 solutions Periodic Table, Periodic Properties and Variations of Properties exercise by students are an easy way to prepare for the exams, as they involve solutions arranged chapter-wise also page wise. The questions involved in Selina Solutions are important questions that can be asked in the final exam. Maximum students of CISCE Class 10 prefer Selina Textbook Solutions to score more in exam.

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