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Chemistry

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 number located above the symbol Tells the number of protons in the nucleus of an atom.
Period elements in a horizontal line on the periodic table. These elements all have the same number of electron levels
Mass number number of protons and neutrons in the nucleus of an atom. It is the atomic mass rounded to the nearest whole number
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.
Neutrons take the atomic mass, and round to the nearest whole number . This gives you the mass number. Take the mass number and subtract the atomic number.
Semimetals have some properties of both metals and nonmetals.Some semimetals are shiny but cannot be shaped.
Noble Gases elements that do not combine easily with other elements.
Nonmetals most have the properties opposite of metals. Nonmetals are dull and cannot be shaped.
Created by: pack
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