100+ Chemistry Interview Questions and Answers Pdf - 2

Question: 6

Define atom?

Atoms are the fundamental building blocks of matter.

The smallest particle of an element that shows the properties of that element is called an atom.

Question: 7

Mention the uses of isotopes?

Isotopes are used in the field of medicine, industries ad agriculture.

An isotope of cobalt is used to treat cancer.

An isotope of uranium is used in nuclear power plants to generate electricity.

Question: 8

Define valency of an element?

Atoms combine to form molecules. An atom of each element has a definite combining capacity called its valency.

Question: 9

Define atomic number?

The number of protons or electrons in an atom is called the atomic number of that atom.

It is denoted by the symbol Z.

Question: 10

An atom is neutral. Why?

The number of electrons in the extra nuclear part is equal to the number of protons in the nucleus. Hence the atom is neutral.