| A | B |
|---|
| matter | anything which has mass and occupies space |
| energy | the capacity to do work |
| elements | substances consisting of one type of atom |
| atom | the smallest, indivisible particle of matter that can have an independent existence. |
| Proton | have electrical charges of a (+) abd are found in the nucleus of an atom. |
| nucleus | the atom;s core; contains protons an done or more neutrons. |
| neutron | an uncharged subatomic particle in the nucleus of an atom. |
| electron | a substomic particle with a negative charge. Electrons circle the atom's nucleus in regions of space known as orbitals. |
| atomic number | the number of protons an atoms has. |
| atomic mass | also referred to as atomic weight |
| isotopes | atoms of an element that have different numbers of neutrons, but constant atomic number. |
| radioactivity | the spontaneous decay of an atom to an atom of a different element by emission of a particle from its nucleus (alpha and beta decay) or by electron capture. |
| ionic bonds | a chemical bond in which atoms of opposite charge are held together by electrostatic attraction |
| ions | an atom that has los tof gained an electron fro its outer shell and hterefore has either a positive or negative charge, repsectively, symbolized by a superscript plus or minus sign and sometimes a number. |
| covalent bonds | a chemical bond created by the sharing of electrons between atoms. |
| polar covalent bonds | When an electrons spends too long with one atom than with another which is sharing the electron; for example, water. |
| hydrogen bonds | a weak bond between two atoms (one is which is hydrogen) with partial but opposite electrical charges. |
| glucose | a six-carbon single sugar; the most common energy source. |
| chemical equations | linear representations of how reactions occur |
| disassociation reaction | when a compound is broken down into two products. |
