The is one kind of particle that makes up the atom and carries a positive charge. the neutron
makes up for "missing mass” and is found in the nucleus. the third kind of particle carries a
charge and has almost no mass.
a electron, negative
b. proton, negative
c. proton, neutral
d. proton, positive

a electron, negative

Explanation:

The electron is subatomic particle that revolve around outside the nucleus and has negligible mass. It has a negative charge. While neutron and proton are present inside the nucleus. Proton has positive charge while neutron is electrically neutral.

An atom consist of electron, protons and neutrons. Protons and neutrons are present with in nucleus while the electrons are 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 sum of neutrons and protons is the mass number of an atom while the number of protons are number of electrons is the atomic number of an atom.

Symbol of proton= P+  

Symbol of neutron= n0  

Mass of proton=1.672623×10-27 Kg

Mass of neutron=1.674929×10-27 Kg

Symbol= e-

Mass= 9.10938356×10-31 Kg

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