EASY
9th CBSE
IMPORTANT
Earn 100

Define 'formula mass' of a compound. 

Important Questions on Atoms and Molecules

EASY
9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 3 - Atoms and Molecules>Very Short Answer Type Questions>Q 4

What do we call those particles which are formed by the gain of electrons by atoms? 

MEDIUM
9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 3 - Atoms and Molecules>Very Short Answer Type Questions>Q 4

What do we call those particles which are formed by the loss of electrons by atoms?

EASY
9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 3 - Atoms and Molecules>Very Short Answer Type Questions>Q 5
A sodium ion has a positive charge because it has more protons than a neutral atom.
MEDIUM
9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 3 - Atoms and Molecules>Very Short Answer Type Questions>Q 5
A chloride ion has negative charge because it has more electrons than a neutral atom.
MEDIUM
9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 3 - Atoms and Molecules>Very Short Answer Type Questions>Q 6

Write the formula of the following compound:

Calcium oxide 

MEDIUM
9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 3 - Atoms and Molecules>Very Short Answer Type Questions>Q 6

Write down the formula for the following compound:

Magnesium hydroxide

MEDIUM
9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 3 - Atoms and Molecules>Very Short Answer Type Questions>Q 7
An element Z has a valency of 3. What is the formula of the oxide of Z? 
MEDIUM
9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 3 - Atoms and Molecules>Very Short Answer Type Questions>Q 8
What is the name of the particle which contains 10 electrons, 11 protons and 12 neutrons?