Periodic Table
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19 terms
Terms | Definitions |
|---|---|
 Atomic Number | the number of protons in an atom |
| Lanthanides | The 14 elements with atomic numbers from 58 to 71 |
| Atomic Mass | total mass of the protons and neutrons in an atom, measured in atomic mass units |
| Metalloids | elements with properties that fall between those of metals and nonmetals |
| Ionization Energy | the amount of energy required to remove an electron from an atom |
| Periodic Law | (chemistry) the principle that chemical properties of the elements are periodic functions of their atomic numbers |
| Atomic Radii | Half the distance between the nuclei of identical atoms that are bonded together |
| Periodic Table | A table that shows the elements, their atomic number, symbol, and average atomic mass; elements with similar chemical properties are grouped together. |
| Periodicity | n. The habit or characteristic of recurrence at regular intervals. |
| Mixture | (chemistry) a substance consisting of two or more substances mixed together (not in fixed proportions and not with chemical bonding) |
| Solute | the dissolved substance in a solution |
| Solvent | a liquid substance capable of dissolving other substances |
| Electron Affinity | the energy change that occurs when an electron is acquired by a neutral atom |
| Alkai Metals | any metal in Group A1 of the periodic table. |
| Alkaline Earth Metals | metallic elements in group 2 of the periodic table which are harder than the alkali metals and are also less reactive |
| Transition Metals | Groups 3-12, 1-2 electrons in the outer energy level, less reactive than alsali-earth metals, shiny, good conductor of thermal energy and electrical current, high density |
| Halogens | group 17; contains nonmetals; 7 electrons in its outermost energy level; very reactive; poor conductors of electric current; never in its uncombined form in nature; combine with most metals to form salts |
| Noble Gases | one of the elements of group 18 of the periodic table(helium, neon,argon, krypton, xenon, and radon); noble gases are unreactive |
| Actinides | the 14 elements with atomic numbers from 90 to 103 |
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