Matter
Anything that occupies space and has mass. Example rock, wood, air, metal, water and chemicals are all matter.
Element
Pictures substance that cannot be broken down into another substance by chemical means. Example gold, helium, mercury and oxygen.
Trace Elements
Make up less than 0.01% of your body but you're still necessary for your body to function. Example iodine (0.15 mg) allows your thyroid gland to properly regulate chemical processes. Iron (0.004%) carries oxygen through blood.
Compound
Is substance containing two or more elements that are chemically bonded in a fixed ratio. Example water (H2O) is a compound that always contains the same ratio of hydrogen combined with oxygen.
Atom
And atom is the smallest possible particle in an element. All elements are made of one type of atom. It gets its name from the Greek word "atomos" meaning invisible.
Proton
A subatomic particle with a single unit of positive electrical charge.
Electron
A subatomic particle with a single unit of negative electrical charge.
Neutron
A subatomic particle with no charge, it is in the nucleus.
Nucleus
And atoms protons and neutrons are tightly packed forming the atoms core called the nucleus. Most of the atoms mass is here.
atomic number
This defines how many protons are in the atom. All atoms of a particular element have the same amount of protons
Isotope
An isotopes of an element have the same amount of protons but a different amount of neutrons
Radioactive isotope
A radioactive isotope is an isotope in which the nucleus breaks down over time giving off radiation.
ionic bond
This occurs when an atom transfers an electron to another atom.
Ion
Atoms that have been electrically charged as a result of gaining or loosing electrons.
covalent bond
This form is when two atoms share electrons
chemical reaction
Changes that result in one or more new substances
Reactants
The starting materials of a chemical reaction
Products
The ending materials of a chemical reaction
Molecule
Two or more atoms held together by covalent bonds.