Molecular Composition

element - A pure substance made of only one kind of atom that can't be broken down into any other substance.

atom - the smallest unit of an element that maintains the chemical properties of that element

nucleus - the center of an atom

particle - a small piece of something. The atom is a particle that is made of three smaller particles.

attract - to pull toward or together

repel - to push away or move away from

proton - A subatomic particle that has a positive charge and that is found in the nucleus of an atom

neutron - A subatomic particle that has no charge and that is found in the nucleus of an atom

electron - A subatomic particle that has a negative charge located outside the atomic nucleus

subatomic particles - Particles found within the atom, protons, neutrons, and electrons.

Bohr Model - model of an atom that shows electrons in circular orbits around the nucleus

Cloud Model - a model of the atom that predicts the most likely locations of electrons

atomic number - the number of protons in the nucleus of an atom

molecule - two or more atoms bonded together

atomic mass - the mass of an atom; protons + neutrons

compound - A substance made up of atoms of two or more different elements joined by chemical bonds

chemical formula - A combination of symbols and that represents the elements in a compound.

subscript - A number written slightly below and to the right of a chemical symbol that shows how many atoms of an element are in a compound.

substance - A single kind of matter that is pure and has a specific set of properties.

mixture - A combination of two or more substances that are not chemically combined

symbol - anything that stands for or represents something else