Electrons, Protons, and Neutrons: An electron is a stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids. A proton is a a stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron, but of opposite sign. A neutron is a a subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen.

Atomic Number: An Atomic Number is the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.

Atomic Mass: The Atomic Mass, is the mass of an atom of a chemical element expressed in atomic mass units. It is approximately equivalent to the number of protons and neutrons in the atom (the mass number) or to the average number allowing for the relative abundances of different isotopes.

How to balance a chemical equation: here are some quick easy steps to balance a chemical equation. 1st Count the atoms of each element in the reactants and the products. 2nd Use coefficients; place them in front of the compounds as needed. This Technic is all trial and error so you have to test things out before knowing it is correct.

chemical changes and physical properties: Chemical changes involve chemical reactions and the creation of new products. Physical properties are used to observe and describe matter.

Chemical changes and physical changes: In a chemical change where there is a chemical reaction, a new substance is formed and energy is either given off or absorbed. A physical change in a substance doesn't change what the substance is.