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Chemistry Vocab.

TermDefinition
element made of one kind of atom. It can't be broken down during a chemical reaction. It combines with other elements to form compounds
atomic mass decimal number below the symbol. It is the mass of the protons and neutrons in an element
atomic number located above the symbol Tells the number of protons in the nucleus of an atom.
group vertical column of elements on the periodic tables. These elements have similar properties.
period elements in a horizontal line on the periodic table. These elements all have the same number of electron levels (valence)
noble gases elements that do not combine easily with other elements.
semi metals have some properties of both metals and nonmetals.Some semi metals are shiny but cannot be shaped.
nonmetals most have the properties opposite of metals. Nonmetals are dull and cannot be shaped.
metals usually shiny and can be formed into shapes (malleable). They are good conductors of electricity.
mass number number of protons and neutrons in the nucleus of an atom. It is the atomic mass rounded to the nearest whole number.
Created by: eguddy
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