Page No. 3

Question 1

The sum of the number of protons and neutrons in an atom

Answer 1

Mass number

Question 2

A part of an atom which comprises protons and neutron

Answer 2

Nucleus

Question 3

The energy needed to disassociate a nucleus into its constituents

Answer 3

Binding energy

Question 4

A special unit constructed to enclose all equipment and material necessary for producing nuclear fission in a controlled way

Answer 4

Nuclear reactor

Question 5

Different forms of an element having the same number of protons, but different number of neutrons

Answer 5

Isotopes

Question 6

An atom with an unstable nucleus

Answer 6

Radioactive atom

Question 7

Negatively charged particles are – positively charged particles are – particles having a neutral charge within an atom are –

Answer 7

Electrons, protons, and neutrons

Question 8

The force that holds the protons and neutrons together

Answer 8

Nuclear force

Question 9

The emission of radiation or particles through the disintegration of the unstable nucleus

Answer 9

Radioactivity

Question 10

A term for the number of protons in the nucleus

Answer 10

Atomic number