Why the chemical properties of an element depend on its atomic number?

Important Questions on Atomic Structure; Physical and Chemical Properties of Matter

HARD

9th West Bengal Board

IMPORTANT

PHYSICAL SCIENCE & ENVIRONMENT CLASS 9>Chapter 4 - Atomic Structure; Physical and Chemical Properties of Matter>EXERCISE>Q 3

Can an element have more than one nuclide? Justify with example.

HARD

9th West Bengal Board

IMPORTANT

PHYSICAL SCIENCE & ENVIRONMENT CLASS 9>Chapter 4 - Atomic Structure; Physical and Chemical Properties of Matter>EXERCISE>Q 4

Why the nucleus of an atom is heavy and positively charge?

HARD

9th West Bengal Board

IMPORTANT

PHYSICAL SCIENCE & ENVIRONMENT CLASS 9>Chapter 4 - Atomic Structure; Physical and Chemical Properties of Matter>EXERCISE>Q 5

State the relation between mass number and atomic number of an atom.

HARD

9th West Bengal Board

IMPORTANT

PHYSICAL SCIENCE & ENVIRONMENT CLASS 9>Chapter 4 - Atomic Structure; Physical and Chemical Properties of Matter>EXERCISE>Q 6

State the number of fundamental particles in ${\mathrm{S}}^{2-}$ ion.

HARD

9th West Bengal Board

IMPORTANT

PHYSICAL SCIENCE & ENVIRONMENT CLASS 9>Chapter 4 - Atomic Structure; Physical and Chemical Properties of Matter>EXERCISE>Q 7

A neutral atom of an element has $2\mathrm{K}, 8\mathrm{L}$ and $5\mathrm{M}$ electrons. State its atomic number, number of protons and valency of the element.

HARD

9th West Bengal Board

IMPORTANT

PHYSICAL SCIENCE & ENVIRONMENT CLASS 9>Chapter 4 - Atomic Structure; Physical and Chemical Properties of Matter>EXERCISE>Q 8

How many electrons can be accommodated in $\mathrm{M}$ shell? Give electronic distribution of ${\mathrm{Ca}}_{20}$.

MEDIUM

9th West Bengal Board

IMPORTANT

PHYSICAL SCIENCE & ENVIRONMENT CLASS 9>Chapter 4 - Atomic Structure; Physical and Chemical Properties of Matter>EXERCISE>Q 1

Volume of sulphur dioxide (Gram molecular mass $64 \mathrm{g}$) in $3.2 \mathrm{g}$ at STP is:

EASY

9th West Bengal Board

IMPORTANT

PHYSICAL SCIENCE & ENVIRONMENT CLASS 9>Chapter 4 - Atomic Structure; Physical and Chemical Properties of Matter>EXERCISE>Q 2

$\frac{1}{{12}^{\mathrm{th}}}$ mass of an isotope of carbon - $12$ is known as: