| A | B |
|---|
| element | substance that cannot be chemically broken down into simpler substances |
| atom | smallest part of an elementthat can be identified as that element |
| nucleus | center of an atom |
| proton | particle with a positive charge |
| neutron | particle without a charge |
| electron | particle with a negative charge |
| atomic number | number of protons in the nucleus of an atom |
| atomic mass | measurement of the total mass of protons and neutrons in an atom (amu) |
| mass number | number of protons and neutrons in the nucleus of an atom |
| energy level | location in an electron cloud where an electron is most likely to be found |
| chemical symbol | abbreviation of the name of an element |
| periodic | repeating pattern |
| group | vertical column of elements in the periodic table |
| period | horizontal row of elemtents in the periodic table |
| metal | elements with property of shiny luster, ductility, and malleability |
| luster | the way a material reflects light |
| malleable | able to be hammered into different shapes |
| ductile | able to be drawn into thin wires |
| nonmetal | element that lacks most properties of a metal |
| halogens | elements that make up Group 17 in the periodic table |
| noble gases | elements that make up Group 18 in the periodic table |
| isotope | atom with same number of protons and different number of neutrons as other atoms |
