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Chemistry Unit 1

TermDefinition
Alkali Metals Group 1 (except Hydrogen); Very reactive, soft, shiny, low density.
Alkaline Earth Metals Group 2; Slightly less reactive than alkali metals; higher density than alkali metals.
Transition Metals Groups 3 - 12; Don't follow all the rules of electrons; good conductors of thermal energy & electric current
Metals Located to the LEFT of the staircase. Good conductors of electric current and heat.
Halogens Group 17; Very reactive nonmetals; Poor conductors of electric current; from salts; never in uncombined form in nature.
Nonmetals Located to the RIGHT of the staircase (plus Hydrogen); Poor conductors of heat and electric current.
Noble Gases Group 18; Unreactive; odorless gases at room temp. All members have a full valence shell.
Metalloids Located along the staircase. Have traits of metals and non metals (semiconductors).
Group Vertical column of the periodic table. All elements within the same column have the same number of valence electrons
Period A horizontal row of elements in the periodic table. All elements within the same row have the same number of energy levels.
Rare Earth Elements The elements placed at the bottom of the periodic table that are set apart due to their unusual atomic characteristics
The Periodic Table an arrangement of elements in which the elements are separated into groups based on a set of repeating properties
Reactants A starting material in a chemical reaction (left side of arrow)
Products The elements or compounds produced by a chemical reaction. (Right side of arrow)
Subscript A number in a chemical formula that tells the number of atoms in a molecule or the ratio of elements in a compound
Coefficient A number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction.
Yields Arrow in chemical equation
Law of Conservation of Mass Matter is not created nor destroyed in any chemical or physical change. Therefore the reactants have to have the same number of atoms of each element as the products.
Atom The smallest unit of an element that retains its properties
Molecule Two or more atoms bonded together
Created by: user-1974052
 

 



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