Atom

basic building block of chemistry.

proton

inside the nucleus with a positive charge.

neutron

inside the nebulas with neutral charge

electrons

orbit the nebulas with an negative charge.

atomic number

the number that places an atom on the periodic table of elements.

atomic mass

the average mass of atoms inside of an element.

atomic nuculas

Dence central part of an atom.

isotops

two or more forms of a same element that contain equal numbers of protons but different numbers of neutrons in their nuclei