Define the following:
Valence shell

Important Questions on Structure of Atom

EASY

9th CBSE

IMPORTANT

Secondary Chemistry>Chapter 4 - Structure of Atom>Questions as per the Guidelines of CBSE>Q 4

Define the following:
Valence electrons

EASY

9th CBSE

IMPORTANT

Secondary Chemistry>Chapter 4 - Structure of Atom>Questions as per the Guidelines of CBSE>Q 4

Define the following:
Valency

EASY

9th CBSE

IMPORTANT

Secondary Chemistry>Chapter 4 - Structure of Atom>Questions as per the Guidelines of CBSE>Q 4

Define the following:
Valency of metals
 

HARD

9th CBSE

IMPORTANT

Secondary Chemistry>Chapter 4 - Structure of Atom>Questions as per the Guidelines of CBSE>Q 5

The average atomic mass of a sample of an element X is 16.2 u. What are the percentages
of ${}_8{}^{16}X$  and  ${}_8{}^{18}\mathrm{X}$ in the sample?
 

HARD

9th CBSE

IMPORTANT

Secondary Chemistry>Chapter 4 - Structure of Atom>Questions as per the Guidelines of CBSE>Q 6

If bromine atom is available in the form of two form isotopes 49.7% ${}_{35}{}^{79}\mathrm{X}$ and 50.3% ${}_{35}{}^{81}\mathrm{Br}$ what is the average atomic mass of Br.

EASY

9th CBSE

IMPORTANT

Secondary Chemistry>Chapter 4 - Structure of Atom>Questions on Higher Order Thinking Skills (HOTS)>Q 1

Name an element that has two shells each one of which is completely filled with electrons.

EASY

9th CBSE

IMPORTANT

Secondary Chemistry>Chapter 4 - Structure of Atom>Questions on Higher Order Thinking Skills (HOTS)>Q 2

Name the element which has the electronic configuration 2, 8, 3.
 

EASY

9th CBSE

IMPORTANT

Secondary Chemistry>Chapter 4 - Structure of Atom>Questions on Higher Order Thinking Skills (HOTS)>Q 3

Name an element which has a total of three shells and there are four electrons in its valence shell. (Carbon/Silicon)