Definitions
1) Atomic Radius: half the distance between two adjacent atoms in a crystal or half the distance between nuclei of identical atoms bonded together.
2) Electronegativity: a measure of the attraction of a nucleus for a bonded electron
3) Family or Group: a vertical column on the periodic table
4) Ionic Radius: the distance from the nucleus to the outer energy level of an ion
5) Ionization Energy: the amount of energy needed to remove the most loosely bound electron from a neutral gaseous atom
6) Metal: element whose atoms lose electrons in chemical reactions to become positive ions (2/3 of the periodic table on the left hand side)
7) Metalloid: an element that has both metallic and nonmetallic properties (on the staircase of the periodic table – exception Al)
8) Noble Gas: a nonreactive element that is in group 18 on the periodic table
9) Nonmetal: element whose atoms will gain or share electrons in a chemical reaction (the right side of the periodic table)
10) Periodic Law: the properties of elements are periodic functions of their atomic numbers
11) Period: a horizontal row on the periodic table
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how do you figure out the atomic mass for an element? October 24, 2011 |
 | When you are looking at the Periodic Table of Elements, the atomic mass is (usually) in the top left hand corner. It is (usually) going to be a decimal due to isotopes. October 25, 2011 - Replied By Expert |
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