| A | B |
|---|
| atomic number | The number of Protons in a atom |
| average atomic mass | The average mass of an element is the average mass of the mixture of its isotopes |
| chemical symbol | A shorthand way to write the name of an element |
| dot diagram | A diagram to represent electrons in the outer energy level |
| electron | Negativly challenged particalsthat move around a atom |
| electron cloud | Region where electrons most probably are found surronding the nucleus of an atom |
| group | In the periodic table, each of the 18 vertical column of elements; each group is made up of elements with similar properties |
| isotope | Atoms of the same element that have different numbers of neutrons |
| mass number | Sum of the protons and neutrons in an atom's nucleus |
| metal | Elements that common metal properties and are found to the left of the stair part of the periodic table |
| metalloid | Elements that have metal and non metal properties |
| nonmetal | Elements that are gas or brittle at room temperature |
| nucleus | Positivly charged center of an atom |
| neutron | Atomic partical with no charge |
| period | A horizontal row in the perodic table |
| peroidic table | A table of elements arranged according to repeated changes |
| proton | Atomic particle with a positive charge that is part of an atoms nucleus |
| quark | Very small particles of matter that make up protons and neutrons |
| binary compound | A chemical compund composed of two elements |
| chemical bond | The force that holds together the atoms in a compound |
| chemical formula | A precise statement that tells which elements are in a compoundand their ratios |
| chemically stable | Discribes an atom whose outer energy level is filled with electrons |
| corrosive | Hazardous compounds that attacks and alters metals, human tissue, and other materials |
| covalent bond | A type of chemical bond where atoms share electrons |
| hydrate | A compound that has water molecules chemically attached to its ions |
| ion | A positivly or negitivle charged atom |
| ionic bond | A type of chemical bond formed by the attraction between opposite charges or the ions in an ionic compound |
| nonpolar molecule | A molecule that does not have oppostily charged ends |
| oxidation number | A positive or negitive number that indicates how many electrons a atom has lost, gained, or shared when bonding |
| polar molecule | A molecule with oppositecharges on its ends |
| polyatomic ion | A group of covelently bonded atoms in which the whole group is positively or negitively charged |
| toxic | Hazardous substance that can injure living tissue |
| allotrope | Different stuctual forms of the same element |
| diatomic molecule | A molecule composed of two of the same elements |
| ductile | Ability of metals to be pulled into wires |
| malleable | Ability of metals to be hammered or rolled into thin sheets |
| metallic bonding | The type of chemical bond in which positively charged ions are surrounded by freely moveing electrons |
| radioactive element | An unstable element whose nucleus breaks down and gives off particles, radiation, and energy |
| semiconducter | A element that conducts electricity under certian conditions |
| sublimation | The process in which a solid changes directly into a vapor without forming a liquid |
| transition element | A element in groups 3-12 of the periodic table |
| transuranium element | Any element having more than 92 protons |
