Chapter 4: Structure of Atom- Exercise- 53

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Chapter 4: Structure of Atom

Class: IX

Exercise number 53

Question 1

For the symbol H, D and T tabulate three sub - atomic particles found each of them.

Answer 1

Symbol	Proton	Neutron	Electron
H	1	0	1
D	1	1	1

Question 2

Write the electronic configuration of any pair of isotopes and isobars.

Answer 2

Two isotopes of carbon are ¹²C and ¹⁴C

The electronic configuration of ¹²C is 2, 4.

The electronic configuration of ¹⁴C is 2, 4.

[Isotopes have same electronic configuration]

⁴⁰₂₉Ca and ⁴⁰₁₈Ar  are a pair of isobars

The electronic configuration of ⁴⁰₂₉Ca is 2, 8, 8, 2

The electronic configuration of ⁴⁰₁₈Ar is 2, 8, 8.

[Isobars have different electronic configuration]