EASY
7th ICSE
IMPORTANT
Earn 100

Explain giving examples the relationship between periodic table and valence electron

Important Questions on Atomic Structure

MEDIUM
7th ICSE
IMPORTANT
Lakhmir Singh's Science Chemistry>Chapter 4 - Atomic Structure>EXERCISES>Q 3
What is valency? Explain the valency of radicals based on charge and on the basis of hydrogen atom.
MEDIUM
7th ICSE
IMPORTANT
Lakhmir Singh's Science Chemistry>Chapter 4 - Atomic Structure>EXERCISES>Q 4

Work on the molecular formulae of following:

Zinc sulphide, Magnesium oxide, Calcium chloride, IronIISulphide

MEDIUM
7th ICSE
IMPORTANT
Lakhmir Singh's Science Chemistry>Chapter 4 - Atomic Structure>EXERCISES>Q 1

Classify the following as the molecules of elements and molecules of compounds

Question Image

EASY
7th ICSE
IMPORTANT
Lakhmir Singh's Science Chemistry>Chapter 4 - Atomic Structure>EXERCISES>Q 1
An element belongs to a group 18 and a second period. Identify the element and write its valency and number of valence electrons.
EASY
7th ICSE
IMPORTANT
Lakhmir Singh's Science Chemistry>Chapter 4 - Atomic Structure>EXERCISES>Q 2

Calculate the number of atoms present in:

One molecule of HNO3

EASY
7th ICSE
IMPORTANT
Lakhmir Singh's Science Chemistry>Chapter 4 - Atomic Structure>EXERCISES>Q 2

Calculate the number of atoms present in:

One molecule of CaCO3.

MEDIUM
7th ICSE
IMPORTANT
Lakhmir Singh's Science Chemistry>Chapter 4 - Atomic Structure>EXERCISES>Q 2

Calculate the number of atoms present in:

One molecule of CH3COOH.

MEDIUM
7th ICSE
IMPORTANT
Lakhmir Singh's Science Chemistry>Chapter 4 - Atomic Structure>WORKSHEET>Q 1

Complete the following table:

Name of Radical Symbol Valency
Carbonate   divalent
  PO43-  
Sulphate   trivalent
Ammonium   monovalent
Calcium    
Iron II