| A | B |
|---|
| Element | A pure substance that can not be changed into a simpler substance by ordinary chemical means. |
| Atom | The smallest unit of an element. |
| Proton | A positivly charged particle found in the nucleus of an atom |
| Neutron | An uncharged, or neutral, particle found in the nucleus of an atom. |
| Mass | A measure of the quantity of matter a body has. |
| Electrons | A particle of an atom located outside of the nucleus that has a negative electrical charge. |
| Energy Level | The areas around an atomic nucleus containing electrons with similar energies. |
| Atomic Number | A number equal to the number of protons in the nucleus of an atom. |
| Mass Number | The amount of protons and neutrons in the nucleus. |
| Isotope | Atoms of the elements that have different mass numbers. |
| Radioisotope | Isotopes of certain elements that send off charged particles and radient energy from their nuclei. |
| Compound | A substance in which two or more elements are chemically combined. |
| Formula | A group of chemical symbols that shows the number and kind of each atom in a compound |
| Molecules | Units of matter in which two or more atoms of the same or different elements are held together by chemical bonds. |
| Diatomic Molecule | A molecule that is made of two atomsof the same element. |
| Covalent Bonding | THe type of chemical bonding in which electrons are shared. |
| Bond Energy | THe energy needed to break a chemical bond. |
| Ionic Bond | A bond formed by the transfern of one or more electrons from one atom to another. |
| Ions | An atom that has either a positive or negative charge. |
| Physical Change | A change in the phase of a substance. |
| Chemical Change | Change inwhich a new substance is formed. |
| Mixture | A combination of two substances that can be separated back to its original state. |
| Solution | A mixture inwhich one substance is dissolved into another. |
| Solute | THe substance that is being dissolved in a solution. |
| Solvent | A substance that is doing the dissolving in a solution. |
