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| cesium |
a highly reactive chemical element of the alkali metal group that has fifty-five protons in each nucleus and that occurs in pure form as a soft, silvery metal melting to a heavy liquid just above room temperature. (symbol: Cs) [1/2 definitions] |
| francium |
a highly radioactive chemical element of the alkali metal group that has eighty-seven protons in each nucleus. (symbol: Fr) |
| lithium |
an extremely reactive chemical element of the alkali metal group that has three protons in each nucleus, occurs naturally only in compounds such as salts, and can be isolated in pure form as a light soft solid. (symbol: Li) [1/2 definitions] |
| potassium |
a chemical element of the alkali metal group that has nineteen protons in each nucleus, that occurs naturally only in compounds such as various salts, and that can be isolated as a soft silver-white solid that oxidizes swiftly in air. (symbol: K) |
| rubidium |
a highly reactive chemical element of the alkali metal group that has thirty-seven protons in each nucleus, that occurs naturally only in compounds with oxygen and other elements, but that can be isolated as a liquid or very soft solid metal. (symbol: Rb) |
| sodium |
a highly reactive chemical element of the alkali metal group that has eleven protons in each nucleus and that occurs naturally only in compounds such as sodium chloride and sodium bicarbonate. (symbol: Na) |
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