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| Anything that has mass and takes up space. |
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A measure of the amount of matter in an object; A fundamental property of an object that is not affected by the forces that act on the object, such as the gravitational force. |
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| A substance that cannot be separated or broken down into simpler substances by chemical means; All atoms of an element have the same atomic number |
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| The smallest unit of an element that maintains the chemical properties of that element |
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| In physical science, an atom's central region, which is made up of protons and neutrons |
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| A subatomic particle that has a positive charge and that is located in the nucleus of an atom; The number of protons in the nucleus is the atomic number, which determines the identity of an element. |
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| A subatomic particle that has no charge and that is located in the nucleus of an atom. |
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| The number of protons in the nucleus of an atom; The atomic number is the same for all atoms of an element. |
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| The sum of the numbers of protons and neutrons in the nucleus of an atom. |
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| A subatomic particle that has a negative charge. |
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| A region in an atom where there is a high probability of finding electron. |
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| An atom that has the same number of protons (or the same atomic number) as other atoms of the same element do but that has a different number of neutrons. (and thus a different atomic mass) |
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| A substance made up of atoms of two or more different elements joined by chemical bonds. |
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| The attractive force that holds atoms or ions together. |
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| A bond formed when atoms share one or more pairs of electron. |
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| A group of atoms that are held together by chemical forces; A molecule is the smallest unit of matter that can exist by itself and retain all of a substance's chemical properties. |
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| An atom, radical, or molecule that has gained or lost one or more electrons and has a negative or positive charge. |
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| The attractive force between oppositely charged ions, which form when electrons are transferred from one atom to another. |
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| The process by which one or more substances change to produce one or more different substances. |
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| A substance or molecule that participates in a chemical reaction. |
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| A substance that forms in a chemical reaction. |
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| The sum of all chemical processes that occur in an organism. |
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| The minimum amount of energy required to start a chemical reaction. |
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| A substance that changes the rate of a chemical reaction without being consumed or changed significantly. |
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| A type of protein that speeds up metabolic reactions in plant and animals without being permanently changed or destroyed. |
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| A chemical reaction in which a reactant loses one or more electrons such that the reactant becomes more positive in charge. |
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