At the moment of releasing the balls, which energy do the balls have ?
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potential energy is the energy which the balls have when they are released
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Sodium is metal which has atomic number 11. It has 1 electron in its last shell which means it has 1 valence electron. In order to get stability by acquiring nearest noble gas configuration. Sodium prefers to loose 1 electron. Hence, we say that sodium has a valency of one and is thus monovalent.
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