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Atoms Test
Term | Definition |
---|---|
Valence Electrons | the # of electrons in an atom’s outer energy level (shell) |
Subscript | number written to the lower right of a chemical symbol, identifying the number of atoms in a molecule |
Group | a vertical column of elements on the Periodic Table |
Period | a horizontal row of elements on the Periodic Table |
Compound | two or more elements chemically combined (ex: NaCl) |
chemical reaction | a process in which new substances with new physical and chemical properties are formed |
An atom that gains an electron would have an oxidation number (overall charge) of | -1 |
chemical formula | a way of writing the name of a compound using chemical symbols |
ion | an atom with an electric charge (positive or negative) |
periodic | a repeating pattern |
mixture | two or more substances physically combined |
When writing the chemical formula of a compound made of a metal and a non-metal, the symbol for the ______ element is written first. | metal |
In an Ionic bond, the “rule” that holds the atoms together in the bond | opposites attract |
all elements in the same group have the same number of __________ | valence electrons |
all elements in the same period have the same number of | energy levels |
metals are used for horseshoes because metals are | malleable |
metals can be used for electricity because metals are | ductile |
Noble Gases | Can not form compounds |
Metalloids | have the properties of both metals and non-metals |
An atom has the same number of protons and electrons so it is ___________________________ | neutral |