EASY
9th CBSE
IMPORTANT
Earn 100

Define 'formula mass' of a compound. 

Important Questions on Atoms and Molecules

EASY
9th CBSE
IMPORTANT

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

MEDIUM
9th CBSE
IMPORTANT

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

EASY
9th CBSE
IMPORTANT
A sodium ion has a positive charge because it has more protons than a neutral atom.
MEDIUM
9th CBSE
IMPORTANT
A chloride ion has negative charge because it has more electrons than a neutral atom.
MEDIUM
9th CBSE
IMPORTANT

Write the formula of the following compound:

Calcium oxide 

MEDIUM
9th CBSE
IMPORTANT

Write down the formula for the following compound:

Magnesium hydroxide

MEDIUM
9th CBSE
IMPORTANT
An element Z has a valency of 3. What is the formula of the oxide of Z
MEDIUM
9th CBSE
IMPORTANT
What is the name of the particle which contains 10 electrons, 11 protons and 12 neutrons?