Science MCQ

The particles in the atomic nucleus are …………….. .

When writing the symbol of its …………… and ………….. are written.

The nucleus of an atom contains 18 protons and 22 neutrons. The atomic number of the element is ……………… .

The nucleus of an atom contains 19 protons and 21 neutrons. The atomic mass number of the element is ………….. .

Isotopes of element have …………….. .

Rutherford alpha-particle scattering experiment was responsible for the discovery of the ………………. .

The maximum number of electrons that can be accommodated in the third orbit is ………… .

The maximum capacity of the N shell is ……………. electrons.

The N shell is the valence shell in ………….. .

The M shell is the valence shell in ……………….. .

The L shell is the valence shell in …………. .

The mass of the electron is …………….. times less than that of a hydrogen atom.

The maximum capacity of the M shell is …………… electrons.

The great Indian philosopher ………….. proposed that matter is made up of invisible tiny particles.

Isotopes of an element have the same number of …………….. .

In the nucleus of a sodium atom (2311Na), there are ……………… neutrons.

The existence of isotopes is due to the presence of different number of …………….. .

The symbol A is used to denote the …………. .