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| an element that is essential for the survival of an organism but is needed in only minute quantities. |
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| A substance containing two or more elements in a fixed ratio |
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| energy levels around the nucleus. set number of electrons per shell. |
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| a variant form of an atom. isotopes of an element have the same number of protons and electrons but different numbers of neutrons |
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| an isotope whose nucleus decays spontaneously, giving off particles and energy. |
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| enlargement of the thyroid gland, can happen when diet doesnt have enough iodine |
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| a process leading to chemical changes in matter, involving the making and/or breaking of chemical bonds |
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| an attraction between two atoms resulting from sharing of outer-shell electrons or the presence of opposite charges on the atoms. |
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| an atom or molecule that has gained or lost one or more electrons, thus acquiring an electrical charge |
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| an attraction between two ions with opposite electrical charges. |
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| an attraction between atoms that share one or more pairs of outer-shell electrons |
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| an attraction between atoms that share one or more pairs of outer-shell electrons |
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| an attraction between atoms that share one or more pairs of outer-shell electrons |
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| an attraction between two ions with opposite electrical charges. |
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| an attraction between atoms that share one or more pairs of outer-shell electrons |
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| a molecule containing polar covalent bonds (having opposite charges on opposite ends) |
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| represents each covalent bond with a line |
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| a type of weak chemical bond formed when a partially positive hydrogen atom from one polar molecule is attracted to the partially negative atom in another molecule |
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| the attraction between molecules of the same kind |
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| a property of water whereby a body becomes cooler as water evaporates from it. |
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| the dissolving agent in a solution |
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| a substance that is dissolved in a solution |
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| a chemical substance that resists changes in pH by accepting hydroen ions from or donating hydrogen ions to solutions |
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