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| 962789334 | Actinide | Shiny, metallic transition metals with atomic numbers 90 through 103 in which electrons are added to 5f orbitals | 1 | |
| 962789335 | alkali metal | Group 1, 1 electron in outer level, very reactive, soft, silver, shiny, low density; Lithium, Sodium, Potassium, Rubidium, Cesium, Francium | 2 | |
| 962789336 | alkaline earth metal | metallic elements in group 2 of the periodic table which are harder than the alkali metals and are also less reactive | 3 | |
| 962789337 | group | A column on the periodic table | 4 | |
| 962789338 | halogen | In group 17. Contains nonmetals, 7 valence electrons in it's outermost energy level. Very reactive. Combines with many metals and salts | 5 | |
| 962789339 | lanthanide | Shiny, metallic transition metals with atomic numbers 58-71 in which the electrons are added to 4f orbitals | 6 | |
| 962789340 | main group element | groups 1,2, 13-18 | 7 | |
| 962789341 | metal | Elements that are good conductors of heat and electric current. | 8 | |
| 962789342 | noble gas | Completely nonreactive family of nonmetals; have 8 valence e-; all are gases at room temp | 9 | |
| 962789343 | nonmetal | Elements that are poor conductors of heat and electric current | 10 | |
| 962789344 | period | A horizontal row of elements in the periodic table | 11 | |
| 962789345 | periodic law | the principle that chemical properties of the elements are periodic functions of their atomic numbers | 12 | |
| 962789346 | plasma | a fourth state of matter distinct from solid or liquid or gas and present in stars and fusion reactors | 13 | |
| 962789347 | salt | A compound made of minerals that, in water, dissolve and form electrolytes | 14 | |
| 962789348 | semiconductor | A crystalline material with intermediate electrical conductivity | 15 | |
| 962789349 | transition metals | Elements in groups 3-12 | 16 | |
| 962789350 | alloy | ..., A COMBINATION; A MIXTURE OF TWO OR MORE METALS | 17 | |
| 962789351 | conduction band | ..., a band within which or into which electrons must move to allow electrical conduction and flow | 18 | |
| 962789352 | crystal | a substance in which the atoms are arranged in orderly, geometric repeating pattern | 19 | |
| 962789353 | bond radius | ..., half the distance from center to center of two like atoms that are bonded together | 20 | |
| 962789354 | electron affinity | ..., Energy released when an atom or ion in the gaseous state gains an electron. Increases from left to right and from bottom to top on the Periodic Table. | 21 | |
| 962789355 | electron shielding | ..., the reduction of the attractive force between a positively charged nucleus and its outermost electrons due to the cancellation of some of the positive charge by the negative charges of the inner electrons | 22 | |
| 962789356 | ionization energy | ..., The amount of energy required to remove an electron from an atom | 23 | |
| 962789357 | van der waals radius | ..., half the distance between the nuclei in adjacent nonbonded molecules | 24 | |
| 962789358 | nuclear reaction | ..., A reaction that involves a change in the nucleus of an atom | 25 | |
| 962789359 | superheavy element | ..., an element whose atomic number is greater than 106 | 26 | |
| 962789360 | transmutation | ..., A type of nuclear reaction that changes the nucleas of an atom into the nucleas of another one | 27 |
