What are electrons nuetrons and protons on the periodic table

The atomic number (top left corner of the element on the periodic table) tells you the number of protons in the element. The number of electrons is equal to the number of protons (else they would form an ion). The number of neutron's can be found by taking the atomic mass (below the element) and subtracting the number of protons from it, as both protons and neutrons weigh about 1amu (atomic mass unit). The neutron weighs a bit more. The atomic mass given is of the isotope of the atom that is stable. There may be multiple isotopes of a single atom (atoms get their chemical properties from their electrons, the number of which is determined by the number of protons. The neutrons don't affect which element the atom is.). For example, Hydrogen can exist with no neutrons, however, it can also exist with 1 neutron. Both are hydrogen (though the latter has another name, deuterium).

They are the components of an atom of that particular substance.

http://en.wikipedia.org/wiki/Atom#Compon…