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| The atom is the basic unit if matter |
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| the nucleus is the center of the atom, which contains the protons and neutrons. |
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| an electron is a negatively charged particle, located in the space surrounding the nucleus. |
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| an element is a pure substance that consists entirely of one type of atom. |
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| a isotope is one of several forms of a single element, which contains the same number of protons but different numbers of neutrons. |
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| a compound is a substance formed by the chemical combination of two or more elements in definite proportions. |
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| a ionic bond is a chemical bond formed when one or more electrons are transferred from one atom to another. |
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| an ion is a atom that has a positive or negative charge. |
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| a covalent bond is a type of bond between atoms in which the electrons are shared. |
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| a molecule is the smallest unit of most compounds and that displays all the properties of that compound. |
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| van der waals force is a slight attraction that develops between oppositely charged regions of nearby molecules. |
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