The basic unit of matter is ______.

(a)

Element

(b)

Atom

(c)

Molecule

(d)

Electron

The sub-atomic particle which revolves around the nucleus is _______.

(a)

Atom

(b)

Neutron

(c)

Electron

(d)

Proton

_______ is positively charged.

(a)

Proton

(b)

Electron

(c)

Molecule

(d)

Neutron

The atomic number of an atom is the ______.

(a)

Number of neutrons

(b)

Number of protons

(c)

Total number of protons and neutrons

(d)

Number of atoms

Nucleons comprises of _______.

(a)

Protons and electrons

(b)

Neutrons and electrons

(c)

Protons and neutrons

(d)

Neutrons and Positron