Explain isotopes with examples.

Important Questions on Structure of the Atom

MEDIUM

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 4 - Structure of the Atom>Practice Questions>Q 17

Explain with examples: isobars. Give any two uses of isotopes. 

EASY

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 4 - Structure of the Atom>Practice Questions>Q 18

Summarise the rules for writing the distribution of electrons in various shells for the first $18$ elements. 

HARD

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 4 - Structure of the Atom>Practice Questions>Q 19

What are the limitations of Thomson's model of atom? 

HARD

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 4 - Structure of the Atom>Practice Questions>Q 1

Draw a labelled diagram showing the production of cathode rays.

HARD

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 4 - Structure of the Atom>Practice Questions>Q 2

Draw a labelled diagram showing the presence of charge on cathode rays in a discharge tube.

MEDIUM

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 4 - Structure of the Atom>Practice Questions>Q 3

Draw a picture of Thomson's model of atom.

MEDIUM

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 4 - Structure of the Atom>Practice Questions>Q 4

Draw a picture of Bohr's model of atom.

MEDIUM

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 4 - Structure of the Atom>Practice Questions>Q 1

Electrons hold the key to the chemical world. Our present-day understanding of $117$ elements and their compounds rests primarily on the number of electrons present in the atoms of these elements and the electronic structures of their atoms.
What is the valence electron?