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unit 2 definitions
science
Term | Definition |
---|---|
valance electron | the electrons that are in the highest energy level of an atom and that are involved in chemical bonding |
electron dot diagram | a representation of the valence electrons in an atom, using dots |
chemical bond | the force of attraction that holds two atoms together |
ion | an atom or group of atoms that has become electrically charged |
ionic bond | the attraction between oppositely charged ions |
ionic compound | A compound that consist of positive and negative ions |
poly atomic ions | an ion that is made of more than one atom |
chemical formula | symbols that show the elements in a compound and the ratio of an atom |
subscript | a number in a chemical formula that tells the number of atoms in a molecule or the ratio of elements in a compound |
crystal | a solid in which the atoms are arranged in a pattern that repeats again and again |
covalent bond | a chemical bond formed when two atoms share electrons |
molecules | a neutral group of two or more atoms held together by covalent bonds |
metallic bond | an attraction between a positive metal ion and the electrons surrounding it. |