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Interactions Ch 1
Chemical Bonding
| Term | Definition |
|---|---|
| chemical bonding | the combining of atoms to form molecules or ionic compounds |
| chemical bond | the interaction that holds atoms or ions together |
| valence electrons | an electron that is found in the outermost shell of an atom (they determine how the atom will bond) |
| 8 or 2 | the number of valence electrons which fill the energy levels |
| ionic bonds | bonds that form when electrons are transferred from one atom to another |
| ion | an atom which has given or taken an electron |
| positive ion | gives (or loses) an electron |
| negative ion | takes (or receives) an electron |
| atoms lose electrons | energy is required |
| atoms gain electrons | energy is given off |
| crystal lattice | a regular pattern in which atoms bond with each other to form a crystal structure |
| covalent bonds | bonds form when atoms share one or more pairs of electrons |
| molecules | the smallest unit of a substance that are bond together with covalent bonds...usually 2 or more elements |
| electron-dot diagrams | show how many valence electrons an atom has |
| diatomic molecules | two atoms of the same element are bonded together |
| diatomic elements | atoms willing to bond with themselves (H, O, N, and the halogens) |
| +2 | Charge of atom with 12 protons and 10 electons |
| -2 | charge of atom with 16 protons and 18 electrons |
| metallic bonds | bonds that form when positive metal ions are surrounded by free-swimming electrons which are able to adjust between ions |
| properties of ionic bonds | high melting and boiling points and they are brittle |
| properties of metallic bonds | metals can bend without breaking, they are ductile (pulled into wire), and malleable (able to be flattened) |
| energy levels | the way that electrons are organized around the nucleus |
| group numbers on periodic table | help you to know how many valence electrons there are |
| -ide | the ending of a word when it gains negative electrons |
| atomic number | the number of protons in the atom |
| noble gases | have a full set of valence electrons |