Question

Positively-charged particles consisting of two protons and two neutrons emitted by radioactive materials are A) beta particles. B) gamma particles. C) alpha particles. D) positron particles

Answer 1

Answer:

C. Alpha particles.

Explanation:

An alpha particle is a radioactive particle emitted from a radioactive source. It is made up of two protons and two neutrons. It is a helium nucleus: that is a helium atom without electrons.

Mass number = 4

= number of proton + number of neutrons

= 2 + 2

Answer 2

Answer:

C. ALPHA PARTICLES

Explanation:

This is the particle emitted by a radioactive material undergoing decaying.

Alpha particle consists of two protons and two neutron. It is a helium atom with mass number 4 and atomic number 2.