Question

. Give reason for the following a) Isotopes of an element are chemically similar b) An atom is electrically neutral c) Noble gases show least reactivity d) Nucleus of an atom is heavy and positively charged. e) Ions are more stable than atoms.

Answer 1

Isotopes have varied number of neutrons but they belong to the same element.

An atom has 1 unit positive charge and 1 unit negative charge on proton and electron respectively.

Noble gases have 8 valence electrons.

Total mass of atom is conserved in nucleus.

Ions are charged but atoms are neutral.

Answer 2

Isotopes have varied number of neutrons but they belong to the same element.

An atom has 1 unit positive charge and 1 unit negative charge on proton and electron respectively.

Noble gases have 8 valence electrons.

Total mass of atom is conserved in nucleus.

Ions are charged but atoms are neutral.