Give the radius of hydrogen atom.

Important Questions on Atoms and Molecules

MEDIUM

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>EXERCISES>Q 6

Give the masses of proton, neutron and electron.

MEDIUM

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>EXERCISES>Q 7

Define atomic mass and atomic mass unit.

MEDIUM

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>EXERCISES>Q 8

Define molecular formula and empirical formula.

EASY

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>EXERCISES>Q 9

Give the names and formulae of two triatomic and two polyatomic molecules.

HARD

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>EXERCISES>Q 10

What is the significance of molecular formula?

MEDIUM

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>EXERCISES>Q 11

Define ion, cation and anion.

MEDIUM

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>EXERCISES>Q 12

Give the names and formulae of two pentatomic and two tetratomic anions.

MEDIUM

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>EXERCISES>Q 13

Define valence electrons, valence shell and valency.