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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 |
Created by:
cbeltrani
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