Which Element Has Two Shells, Both of Which Are Completely Filled with Electrons? - Science

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

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Solution

Neon

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Chapter 5: Periodic Classification of Elements - Exercises [Page 91]

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NCERT Science Class 10
Chapter 5 Periodic Classification of Elements
Exercises | Q 3.1 | Page 91

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Fill in the blank:

The formulae of chloride of metal M is MCl2. The metal M belongs to ……………. group.


Elements in the same group show the same valency. Give scientific reason.


Write the electronic configuration of K and Ne.


The atomic masses of three elements A, B and C having similar chemical properties are 7, 23 and 39, respectively.

  1. Calculate the average atomic mass of elements A and C.
  2. Compare the average atomic mass with atomic mass of B.
  3. What could the elements A, B and C be?

An element 'X' belong to 3rd period and group 13 of the Modern Periodic Table.

(a) Determine the valence electrons and the valency of 'X'.

(b) Molecular formula of the compound formed when 'X' reacts with an element 'Y' (atomic number = 8).

(c) Write the name and formula of the compound formed when 'X' combines with chlorine


An element 'M' with electronic configuration (2, 8, 2) combines separately with (NO3), (SO4)2– and (PO4)3– radicals. Write the formula of the three compounds so formed. To which group and period of the Modern Periodic Table does the element 'M' belong? Will 'M' form covalent or ionic compounds? Give reason to justify your answer.


Classify the following elements into metals, non-metals and metalliods

As, C, Hg, Mg, S, Si


An element Z has atomic number 16. Answer the following questions on Z:

1) State the period and group to which Z belongs

2) Is Z a metal or a non-metal?

3) State the formula between Z and hydrogen

4) What kind of a compound is this?


Differentiate between Normal elements and Transition elements.


What happens to the metallic character of the elements as we go down in a group of the periodic table?


Name the element which is in  first group and third period.


How do electronic configurations of elements change in second period of periodic table with increase in atomic numbers?


 In which part of a group would you separately expect the elements to have the greatest metallic character


The electronic configuration of the atom of an element X is 2, 8, 4. In modern periodic table, the element is places in :

(a) 2nd group
(b) 4th group
(c) 14th group
(d) 8th group


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Explain why are the following statements not correct:

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


Write two reasons responsible for late discovery of noble gases ?


An element 'M' has atomic number 11.

(a) Write its electronic configuration.

(b) State the group to which 'M' belongs.

(c) Is 'M' a metal or a non-metal.

(d) Write the formula of its chloride.


Atomic number of metal ‚A‛ is 11, while atomic number of metal ‚B‛ is 20. Which of them will be more reactive? Write the chemical reaction of dilute HCl  with metal ‚A‛.


Taking into consideration the period of the elements given below, answer the following questions: 

Elements Atomic Radius (pm)
O 66
B 88
C 77
N 74
Be 111
Li 152
  1. Arrange the above elements in decreasing order of their atomic radii.
  2. State the period to which the above elements belong.
  3. Why this arrangement of elements is similar to the above period of modern periodic table?
  4. Which of the above elements have the biggest and the smallest atom?
  5. What is the periodic trend observed in the variation of atomic radius while going from left to right within a period?

What is modern periodic law?


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


A group of elements in the periodic table is given below ( Boron is the first member of the group and thallium is the last)
Boron
Aluminium
Gallium
Indium
Thallium
Answer the following questions in relation to the above group of elements:
(a) Which element has the most metallic character?
(b) Which element would be expected to have the highest electro negativity?
(c) If the electronic configuration of aluminium is 2, 8, 3, how many electrons will be there in the outermost shell of thallium?
(d) The atomic number of boron is 5. Write the chemical formula of the compound formed when boron reacts with chlorine.
(e) Will the elements in the group to the right of this boron group be more metallic or less metallic in character? Justify your answer.


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.


Arrange the following as per instruction given in the bracket

Na, K, Cl, S, Si (increasing ionisation potential)


Choose the word or phrase from the bracket which correctly complete each of the following statement: 

Metals are good ................. (oxidising agents/reducing agents) because they are electron ............. (acceptors/donors). 


With reference to the variation of properties in the Periodic table, which of the following is generally true?


The position of elements A, B, C, D and E in the periodic table are shown below:

Group 1

Group 2

Group 17

Group 18

 

 

 

D

 

B

C

 

A

 

 

E

State which is metals, non-metals, and noble gas in this table.


The position of elements A, B, C, D and E in the periodic table are shown below:

Group 1

Group 2

Group 17

Group 18

 

 

 

D

 

B

C

 

A

 

 

E

State which is most reactive (i) metal (ii) non-metal

 


The position of elements A, B, C, D and E in the periodic table are shown below:

Group 1

Group 2

Group 17

Group 18

 

 

 

D

 

B

C

 

A

 

 

E

Which type of ion will be formed by elements A, B, and C.

 


An element belongs to the third period and Group IIIA (13) of the periodic table. State: if it is a metal or non-metal?


Name and state the following with reference to the elements of the first three periods of the periodic table.

Metalloid in Period 3.


An element A has 2 electrons in its fourth shell. State:

position in the periodic table


An element A has 2 electrons in its fourth shell. State:

is it a metal or non-metal


(a) Fill in the blanks and rewrite the completed statements: 

(i) ________ group in the periodic table contains elements that are all gases at room temperature. 

(ii) Very fine particles mainly scatter ______ light.


Fill in the blank and rewrite the completed statement:

________ group in the periodic table contains elements that are all gases at room temperature.


Give Scientific Reason:
Atomic size increase down the group.

Answer the following question:
State the four blocks of the modern periodic table based on the electronic configuration of elements.


Write the electronic configuration of two elements A and B whose atomic numbers are 20 and 17 respectively. Write the molecular formula of the compound formed when element A reacts with element B. State whether this compound is acidic, basic or neutral. Give a reason to justify your answer.


State the property trends in general of elements on moving from left to right in a period of the periodic table.


Name or state following with reference to the element of the first three periods of the periodic table.

A metal in period 3 having valency 3.


Name or state following with reference to the element of the first three periods of the periodic table.

The valency of the element in period 3 having atomic number 17.


Electron Affinity is maximum in ______.


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