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| The smallest particles of an element that have the properties of that element; consist of electrons, protons, and neutrons |
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| The mass of an isotope of an element measured in units. |
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| The number of protons in the nucleus of an atom; the number that identifies an element. |
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| The science that deals with the composition and properties of substances and various elementary forms of matter. |
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| Substance made of two or more kinds of atoms compined in different proportions. |
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| Substances made entirely of one kind of atom. |
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| Negatively charged particles found in the spaces outside the nuclei of atoms; have much less mass than protons or neutrons. |
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| Atoms that differ from other atoms of the same element by the number of neutrons in their nucleus. |
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| Particles in the nuclei of atoms that have no electrical charge; have roughly the same mass as protons. |
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| In a eukaryotic cell, a large, membrane-enclosed organelle that contains the cell's DNA; in an atom, containing protons and neutrons. |
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| Positively charged particles found in the nuclei of all atoms; have roughly the same mass as neutrons. |
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| The process in which the nucleus of an atom gives off radiation or charged particles; changes the atom to another isotope or a different element. |
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| A force of attraction between atoms that holds them together in compounds. |
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| A written representation of a compound in which a chemical symbol replaces each element. |
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| The process in which chemical bonds are broken and the atoms form new bonds, producing new substances. |
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| A chemical bond that is formed by the sharing of electrons. |
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| A molecule formed when two atoms of the same element combine in a covalent bond. |
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| An atom or group of atoms with an excess electrical charge. |
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| The force of attraction between two ions in a chemical compound. |
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| Law of Conservation of Mass |
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| The principal stating that mass can neither be created nor destroyed. |
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| An uncharged group of atoms held together by covalent bonds; the smalled particle that retains the properties of a covalent compound. |
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| The new substances produced by chemical reactions. |
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| The substances that take part in chemical reactions. |
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| A kind of chemical formula that shows how atoms in a molecule are bonded to one another. |
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| A mixture in which the solute particles are larger than molecules or ions, but are to small to settle out. |
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| A combination of substances that are physically mixed without forming new chemical bonds. |
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| Substances that are dissolved in solvents. |
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| The substance, ussually a liquid, that makes up the bulk of a solution. |
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| A mixture that seperates when left still. |
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| Any compound that produces hydrogen ions in water solution. |
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| Any compound that produces excess hydroxide ions when dissolved in water. |
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| A substance that changes color when the pH goes above or below a certain value. |
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| The reaction of an acid with a base to produce a neutral solution. |
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| A unit of measuremnt that indicates the concentration of hydrogen ions in a solution. |
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| An ionic compound produced by the neutralization reaction between an acid and a base. |
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