EASY
9th CBSE
IMPORTANT
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The outermost shell of an atom cannot hold more than electrons.

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Important Questions on Structure of Atom

EASY
9th CBSE
IMPORTANT
Secondary Chemistry>Chapter 4 - Structure of Atom>Problems for Proficiency>Q 12

The maximum number of electrons which M-shell can accommodate is _____.

HARD
9th CBSE
IMPORTANT
Secondary Chemistry>Chapter 4 - Structure of Atom>Problems for Proficiency>Q 12
When the M-shell of an atom is filled with 8 electrons then the next electron is filled in _____ shell.
EASY
9th CBSE
IMPORTANT
Secondary Chemistry>Chapter 4 - Structure of Atom>Problems for Proficiency>Q 12
Neon is an inert atom because it contains _____ electrons in its outermost shell. (Write in number(s))
EASY
9th CBSE
IMPORTANT
Secondary Chemistry>Chapter 4 - Structure of Atom>Problems for Proficiency>Q 12

The maximum number of electrons that can be filled in N-shell is _____ according to the 2n2 rule. (Give the answer in numerals)

EASY
9th CBSE
IMPORTANT
Secondary Chemistry>Chapter 4 - Structure of Atom>Problems for Proficiency>Q 1
Define the isotopes of an element.
EASY
9th CBSE
IMPORTANT
Secondary Chemistry>Chapter 4 - Structure of Atom>Problems for Proficiency>Q 2
Chemical properties of all the isotopes of an element are similar. Give one reason. 
HARD
9th CBSE
IMPORTANT
Secondary Chemistry>Chapter 4 - Structure of Atom>Problems for Proficiency>Q 3

Compositions of the nuclei of two atoms A and B are given as: 

(a) A has 6 protons, 6 neutrons 
(b) B has 6 protons, 8 neutrons. 
(i) What are the mass numbers of A and B? 
(ii) What is the relation between A and B? 
(iii) Which element or elements do these represent? 

HARD
9th CBSE
IMPORTANT
Secondary Chemistry>Chapter 4 - Structure of Atom>Problems for Proficiency>Q 4

Write the nuclear composition of each isotope and complete the following table:

Isotopes Protons Neutrons
H11    
D12    
T31    
C612    
C614    
Cl1735    
Cl1737