chemical formula - is a group of chemical symbols and numbers that represent the elements and the number of atoms of each element that make up a compound., to become stable - This is why atoms share, gain or lose valence electrons, 2 or 8 - Atoms are most stable with ____ valence electrons., compound - A ___ is a substance made up of two or more different elements., element - ___ is made of one type of atom, covalent - __ is a chemical bond formed when two atoms share one or more pairs of valence electrons., molecule - ___ is a group of atoms held together by covalent bonding that acts as an independent unit., polar molecule - A molecule that has a partial positive and a partial negative end is a ___, Helium (He) - Is an example of an element , Water (H20) - Is an example of a compound,

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