Question

2. (a) Name the particle which revolves around the
nucleus of an atom and state its mass and
charge.
(b) Why is an atom of an element electrically
neutral?​

Answer 1

Answer:

a)The nucleus contains two types of subatomic particles, protons and neutrons. The protons have a positive electrical charge and the neutrons have no electrical charge. A third type of subatomic particle, electrons, move around the nucleus. The electrons have a negative electrical charge.

b)

Atoms of each element are distinguished from each other by the number of protons that are present in their nucleus. ... A proton and an electron have an equal amount but an opposite type of charge. Thus, if an atom contains equal numbers of protons and electrons, the atom is described as being electrically neutral.

Answer 2

1. protons and neutrons

2. because they have equal number of protons (positively charged) and electrons (negatively charged)