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| The smallest unit of an element that maintains the properties of that element. |
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| A subatomic particle that has a negative charge. |
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| An atom’s central region. It is made up a protons and neutrons. It is positively charged. |
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| A region inside an atom where electrons are likely to be found |
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| Positively charged particles in the nucleus. |
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| A unit of mass that describes the mass of an atom or molecule |
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| Particles of the nucleus that have no electrical charge |
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| The number of protons in the nucleus of an atom. |
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| Atoms that have the same number of protons but have different numbers of neutrons. |
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| The sum of protons and neutrons in an atom. |
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| The mass of an atom expressed in atomic mass units |
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| Gravitational Force, Electromagnetic Force, Strong Force, and weak force |
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| Means happens at regular intervals |
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| The law that states that the repeating chemical and physical properties of elements change periodically with the atomic numbers of elements. |
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| Tend to be shiny, good electricity conductors, malleable, good thermal energy conductors |
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| In chemistry it is a horizontal row of elements on the periodic table. It is also called a family. |
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| All element in Group 1 of the periodic table. |
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| In chemistry it is a vertical row of elements on the periodic table. |
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| 1 of the elements of Group 2 of the periodic table. |
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| Alkali Metals. Most reactive because they can easily give away its 1 outer level electron. Includes Sodium and Potassium |
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| Alkaline Earth Metals. Less reactive than Alkali. Include Magnesium and Calcium. |
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| Transition Metals: Do not give away their electrons as easily Group 1 and Group 2. Less reactive than Groups 1 & 2 |
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| Row 1 Shiny, reactive metals |
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| Row 2, radioactive or unstable. |
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| Nonreactive nonmetals. Group 18 |
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