ICSE ICSE Class 7 - CISCE Question Bank Solutions

What are orbits or shells ?

What is the maximum number of electrons present in:

1. first shell
2. second shell
3. third shell and
4. fourth shell

Name three non-metals/radicals which have valency -1, -2, and -3.

Define: Covalent bond

Give two examples for each of ionic and covalent bond.

Write electronic configuration of oxygen, fluorine, sodium, silicon, argon.

Who originated the word ‘atom’ ?

What does the word ‘atom’ mean?

State Dalton’s atomic theory.

How did Neils Bohr visualise the atom ?

Name the particle or particles you would expect to find in :

The orbit of an atom

Name the particle or particles you would expect to find in :

The nucleus of an atom

An atom has 13 protons and 14 neutrons.

What is the atomic number of the atom ?

An atom has 13 protons and 14 neutrons.

How many electrons would be present in this atom ?

An atom has 13 protons and 14 neutrons.

What is the atomic mass of the atom ?

Define: An Atom:

A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.

What is such a particle called ?

A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.

What is the mass number of X?

A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.

What is the atomic numebr of X ?

A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.

Does the particle have an excess of electrons or a deficiency of electrons ?