MEDIUM
7th CBSE
IMPORTANT
Earn 100

Can an atom exist with no electron in it? Explain.

Important Questions on Atomic Structure

MEDIUM
7th CBSE
IMPORTANT
Focus Science Social Science Class 7 Term I>Chapter 4 - Atomic Structure>Evaluation>Q 3
What are the three sub-atomic particles present in an atom? Tabulate their mass and charge.
EASY
7th CBSE
IMPORTANT
Focus Science Social Science Class 7 Term I>Chapter 4 - Atomic Structure>Evaluation>Q 4
Valencies of K=1 and Cl=1. Write the formula of the following compound:
Potassium chloride.
EASY
7th CBSE
IMPORTANT
Focus Science Social Science Class 7 Term I>Chapter 4 - Atomic Structure>Evaluation>Q 4
Valencies of Mg=2 and Cl=1. Write the formula of the following compound:
Magnesium chloride.
EASY
7th CBSE
IMPORTANT
Focus Science Social Science Class 7 Term I>Chapter 4 - Atomic Structure>Evaluation>Q 4

Valencies of O=2 and ferrous =2 . Write the formula of the following compound:

Ferrous oxide.

EASY
7th CBSE
IMPORTANT
Focus Science Social Science Class 7 Term I>Chapter 4 - Atomic Structure>Evaluation>Q 4
Valencies of Ca=2 and O=2. Write the formula of the following compound:
Calcium oxide.
EASY
7th CBSE
IMPORTANT
Focus Science Social Science Class 7 Term I>Chapter 4 - Atomic Structure>Evaluation>Q 4

Valencies of K=1 and O=2 . Write the formula of the following compound:

Potassium oxide.

MEDIUM
7th CBSE
IMPORTANT
Focus Science Social Science Class 7 Term I>Chapter 4 - Atomic Structure>Evaluation>Q 1
An atom of an element has no electron, will that atom have any mass or not? Can an atom exist without electron? If so then give example.
HARD
7th CBSE
IMPORTANT
Focus Science Social Science Class 7 Term I>Chapter 4 - Atomic Structure>Evaluation>Q 2
Find what is common salt. Name the elements present in it. Write the formula of the common salt. What are the atomic number and mass number of elements? Write the ions in the compound?