5. the nucleus of an atom is (1 point)
o the central core and is composed of protons and neutrons
opositively charged and has more protons than neutrons
negatively charged and has a high density
negatively charged and has a low density

A = The central core and is composed of protons and neutrons.

Explanation:

An atom consist of electrons, protons and neutrons. The neutrons and protons are present inside the nucleus, which is central core of atom and have positive charge. While electron is present out side the nucleus.

All these three subatomic particles construct an atom. A neutral atom have equal number of proton and electron. In other words we can say that negative and positive charges are equal in magnitude and cancel the each other. For example if neutral atom has 6 protons than it must have 6 electrons.

The electron is subatomic particle that revolve around outside the nucleus and has negligible mass. It has a negative charge.

Symbol= e-

Mass= 9.10938356×10-31 Kg

It was discovered by j. j. Thomson in 1897 during the study of cathode ray properties.

While neutron and proton are present inside the nucleus. Proton has positive charge while neutron is electrically neutral. Proton is discovered by Rutherford while neutron is discovered by James Chadwick in 1932.

Symbol of proton= P+  

Symbol of neutron= n0  

Mass of proton=1.672623×10-27 Kg

Mass of neutron=1.674929×10-27 Kg