ICSE ICSE Class 8 - CISCE Question Bank Solutions

Define the term ‘atomic number’ of an atom.

Define the term ‘mass number’ of an atom.

If an atom ‘A’ has mass number 35 and atomic number 17, state the number of protons, electrons and neutrons it contains.

State why the atomic weight of an element is also termed relative atomic mass.

If an atom ‘A’ has atomic number 19 and mass number 39, state –

1. Its electronic configuration.
2. The number of valence electrons it possesses.

Draw the atomic diagram of the following element showing the distribution of – protons, neutrons and the electrons in the various shell of the atom.

Carbon – \[\ce{^12_6C}\]

[The upper number represent the – mass number and the lower number represent the – atomic number e.g. calcium – mass number = 40, atomic number = 20]

Draw the atomic diagram of the following element showing the distribution of – protons, neutrons and the electrons in the various shell of the atom.

Oxygen – \[\ce{^16_8O}\]

[The upper number represent the – mass number and the lower number represent the – atomic number e.g. calcium – mass number = 40, atomic number = 20]

Draw the atomic diagram of the following element showing the distribution of – protons, neutrons and the electrons in the various shell of the atom.

Phosphorus – \[\ce{^31_15P}\]

[The upper number represent the – mass number and the lower number represent the – atomic number e.g. calcium – mass number = 40, atomic number = 20]

Draw the atomic diagram of the following element showing the distribution of – protons, neutrons and the electrons in the various shell of the atom.

Argon – \[\ce{^40_18Ar}\]

[The upper number represent the – mass number and the lower number represent the – atomic number e.g. calcium – mass number = 40, atomic number = 20]

Draw the atomic diagram of the following element showing the distribution of – protons, neutrons and the electrons in the various shell of the atom.

Calcium – \[\ce{^40_20Ca}\]

[The upper number represent the – mass number and the lower number represent the – atomic number e.g. calcium – mass number = 40, atomic number = 20]

‘Valency is the number of hydrogen atoms which can combine with [or displace] one atom of the element [or radical] forming a compound’. With reference to the above definition of valency, state the valency of chlorine in hydrogen chloride, giving reasons.

Match the statements in List I with the correct answer from List II.

The diagram represents an isotope of hydrogen [H]. Answer the following:

Atomic no. = 1
Mass no. = 1

Are isotopes atoms of the same element or different elements.

The diagram represents an isotope of hydrogen [H]. Answer the following:

Atomic no. = 1
Mass no. = 1

Do isotopes have the same atomic number or the same mass number?

The diagram represents an isotope of hydrogen [H]. Answer the following:

Atomic no. = 1
Mass no. = 1

If an isotope of ‘H’ has mass no. = 2, how many electrons does it have.

The diagram represents an isotope of hydrogen [H]. Answer the following:

Atomic no. = 1
Mass no. = 1

If an isotope of ‘H’ has mass no. = 3, how many neutrons does it have.

The diagram represents an isotope of hydrogen [H]. Answer the following:

Atomic no. = 1
Mass no. = 1

Which sub-atomic particles in the 3 isotopes of ‘H’ are the same.

Draw the structure of the following atoms showing the nucleus containing – protons, neutrons and the orbits with the respective electron:

Lithium [At. no. = 3, Mass no. = 7]

Draw the structure of the following atoms showing the nucleus containing – protons, neutrons and the orbits with the respective electron:

Carbon [At. no. = 6, Mass no. = 12]

Draw the structure of the following atoms showing the nucleus containing – protons, neutrons and the orbits with the respective electron:

Silicon [At. no. = 14, Mass no. = 28]