100+ Chemistry Interview Questions and Answers Pdf - 1

Question: 1

What are isotopes?

Atoms having the same atomic number but different mass numbers are called isotopes.

Question: 2

What is meant by mass number?

The total mass of protons and neutrons is approximately the mass of an atom.

Mass number of atom can be defined as the sum of the number of neutrons and protons present in the nucleus of an atom. It is denoted by the symbol A.

Question: 3

What are protons?

Protons are positively charged particles present in the core of an atom called nucleus.

The number of protons in the nucleus is equal to the number of electrons revolving around the nucleus.

Question: 4

What are neutrons?

Neutrons are neutral particles present in the nucleus of an atom.

Question: 5

What are electrons?

Electrons are negatively charged sub atomic particles present in the outer part of atom.

Electrons which constitute the extra nuclear part revolve around the nucleus in a particular path called orbit.

The number of electrons in an atom is equal to the number of protons in the nucleus.