| A | B |
|---|
| Chemical Bond | When atoms of different elements combine to create compounds. When atoms share or exchange electrons. |
| Energy levels | Different levels containing electrons surrounding the nucleus. |
| Valence electrons | Electrons in the outermost energy level. |
| Octet | When an atom has 8 valence electrons. |
| Octet rule | Atoms will exchange or share electrons to form an octet. |
| Lewis Dot diagram | Shows element symbol surrounded by 1 to 8 dots represnting the valence electrons. |
| Ionic Bonds | Electrons are transferred from one atom to another. |
| Ions | Atoms that either gain or lose an electron |
| Covalent Bonds | Electrons are shared between atoms. |
| Diatomic Molecules | Covalently bonded atoms of the same type. |
| Ionic Compound | A coumpound compsed of ions. |
| Oxidation Number | The number of electrons lost gained or shared when bonding occurs. |
| Monoatomic ions | ions that consist of a single atom. |
| Subscripts | Tell how many atoms of each element are in a compound. |
| Polyatomic ions | Contain more than one type of atom. |
| Covalent Compounds | Compounds formed through a covalent bond. Also reffered to as molecular compounds. |
| Binary Compounds | Covalent Compounds that consist of 2 elements. |
| Empirical Formula | The simplest whole-number ratios by which elements combine. |
| Molecular Formula | Actual number of atoms of each element in the compound. |
| Relative Mass | All atoms are assigned this, known as the atomic mass unit. |
| Formula Mass | Mass of compounds relative to other compounds. |
| Compounds | 2 or more elements bonded together to form a new substance (There are more than 4 million compounds that exist, and carbon is found in 94% of them.) |
| Molecules | Smallest particles of covalent bonds |
| Valence Shell | The outermost energy level |
| Positive Ion | Positively charged atom that has lost electrons |
| Negative Ion | Negatively charged atom that has gained electrons |
| Electronegativity | The attraction an atom has for the shaired pair of electrons in a covalent bond |
| Polymers | Repeating chains of natural or synthetic materials (cellulose and synthetic plastics are examples) |
| Chemical Formula | A representation of a compound that includes the symbols and numbers of atoms in the compound |
| Atom | Smallest particle of an element consisting of protons, neutrons, and electrons |
