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| The property that reflects the quantity of matter within a sample. |
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| The basic unit of a chemical element |
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| A substance that can not be broken down by chemical means. They are defined by the number of protons they possess |
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| A particle in the nucleus of an atom, with a positive charge of +1 and a mass of 1 |
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| A non-charged particle, found in the nucleus of an atom, with the same mass as a proton |
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| A negatively charged particle, with a charge of -1, it acts as the primary carrier of electricity |
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| A substance that results from the combination of two or more different chemical elements |
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| A group of atoms linked together by sharing electrons in a chemical bond. It is the smallest part of a compound that can participate in a chemical reaction |
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| A force by which atoms or ions are bound in a molecule or crystal |
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| A chemical bond formed between two atoms when they share electrons in pairs, so that each atom provides half of the electrons to the bond |
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| A chemical bond formed between two oppositely charged ions when one atom transfers electrons to another atom |
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| An electrically charged atom, or group of atoms, the electrical charge of which results when a neutral atom (or group of atoms) loses or gains one or more electrons during a chemical reaction. |
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| An atom that has lost an electron, resulting in a positive charge |
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| An atom that has gained an electron, resulting in a negative charge |
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| A weak chemical bond formed through a hydrogen atom |
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| A type of covalent bond between two atoms in which electrons are shared unequally. One end of the molecule has a slightly negative charge and the other end has a slightly positive charge |
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