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Terms
Terms and definitions
20
Chemistry
Not Applicable
06/02/2009

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Term
Ion
Definition
An atom (or group of atoms) that has positive or negative charge resulting from the gain or loss of valence electrons
Term
Isotopes
Definition
Atoms having the same atomic number but different mass number; atoms of the same elements that differ by the number of neutrons in the nucleus.
Term
Anion
Definition
A negatively charged ion
Term
Cation
Definition
A positively charged ion
Term
Electron Affinity
Definition
The amount of energy involved when a neutral atom gains an electron
Term
Isoelectronic
Definition
A term for two or more ions(or ions and an atom) having the same electron configuration; ex Na+ and F- each have 10 electrons, and their electron configurations are identical to the noble gas Neon
Term
Ionization Energy
Definition
The amount of energy necessary to remove an electron from a neutral atom in the gaseous state
Term
Valence Electrons
Definition
The electrons that occupy the outermost s and p sublevels of an atom. the electrons in the highest s and p sublevels in an atom that undergo reaction and from chemical bonds.
Term
Representative Elements
Definition
The Group A (1,2 and 13-18) elements in the periodic table: also termed main group elements.
Term
Transition Elements
Definition
The group B(3-12) elements in the periodic table
Term
Metals
Definition
an element that is generally shiny in Appearance has high density high melting point and is a good conductor of heat and electricity
Term
Semimetals
Definition
An element that is generally metallic in appearance and has properties midway between those of a metal and a nonmetal; also called a metalloid.
Term
Nonmetals
Definition
An element that is generally dull in appearance, has a low density, low melting point and is not a good conductor of heat and electricity.
Term
Alkali Metals
Definition
Group 1/IA on the periodic table
Term
Alkaline Earth Metals
Definition
Group 2/IIA on the periodic table
Term
Noble Gases
Definition
Group 18/VIIIA on the periodic table
Term
Halogens
Definition
Group 17/VIIA on the periodic table
Term
Lanthanides
Definition
Period 6 of Inner Transitional Elements
Term
Actinides
Definition
Period 7 of Inner Transitional Elements
Term
Inner Transitional Elements
Definition
Elements outside periodic table
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