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| The smallest particle of a given type of matter. |
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| The idea that matter is made up of fundamental particles called atoms. |
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Definition
| Negatively-charged particle. |
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Definition
| A positively charged subatomic particle. |
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Definition
| A subatomic particle with a mass equal to a proton but with no electrical charge. |
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Definition
| Any of two or more atoms of an element that are chemically alike but have different masses. |
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| The number of protons in the nucleus of an atom of an element. |
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Definition
| The small, dense, positively charged central core of an atom. |
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Definition
| The sum of the protons and neutrons in the nucleus of an atom. |
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| The space around the nucleus of an atom where the atom's electrons are found. |
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Definition
| An electron in the outermost energy level of an atom. |
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