Terms : Hide Images
| 2057897723 | Atomic Mass | The average mass of all the isotopes of an element | 0 | |
| 2058092406 | Atomic nucleus | An atom's dense central core, containing protons and neutrons. | 1 | |
| 2114054712 | Atomic number | Number of protons in an atom | 2 | |
| 2114055307 | Atomic symbol | A one or two letter abbreviation for an element | 3 | |
| 2114056063 | Electron | A negatively charged particle | 4 | |
| 2114056687 | Element | A pure substance made of only one kind of atom | 5 | |
| 2114057868 | Group | A column on the periodic table | 6 | |
| 2114059616 | Isotope | Atoms of the same element that have different numbers of neutrons | 7 | |
| 2114061969 | Mass number | the sum of the number of neutrons and protons in an atomic nucleus | 8 | |
| 2114062947 | Metal | Elements that are good conductors of heat and electric current. | 9 | |
| 2114064374 | Metalloid | Are element with properties that fall between those of metals and nonmetals. | 10 | |
| 2114065839 | Neutron | A subatomic particle that has no charge and that is found in the nucleus of an atom | 11 | |
| 2114066631 | Nonmetal | Group of elements that may be solids, liquids, or gases at room temp and tend to be poor conductors of heat and electricity, and NOT malleable, ductile, or lustrous | 12 | |
| 2114068858 | Nucleon | A proton or a neutron. | 13 | |
| 2114069324 | Period | A horizontal row in the periodic table. | 14 | |
| 2114070132 | Periodic table | A table that shows the elements, their atomic number, symbol, and average atomic mass; elements with similar chemical properties are grouped together. | 15 | |
| 2114071277 | Periodic trend | Gradual change of any property in the elements across a period. | 16 | |
| 2114072127 | Proton | A subatomic particle that has a positive charge and that is found in the nucleus of an atom | 17 |
