Assertion : An atom is electrically neutral. Reason : Atoms have equal number of protons and electrons.

The nucleus of an atom consist of protons and electrons ..

Assertion : The number of protons or the number of neutrons is known as atomic number. Reason : The mass number is sum of protons and neutrons.

Assertion : Hydrogen is the simplest atom Reason : Its nucleus contains only two protons

What form of radioactive decay reduces the atomic number of protons by 2 ?

Assertion : atomic masses of elements are whole numbers . Reason : atoms of the same element exist as isotopes .