Formulae and percentage composition

Element pose five combination powers. For example, 1 atom of oxygen combine with 2 atom of hydrogen, to form water, but 1 atom of chlorine combines with only 1 atom of hydrogen to form hydrogen chloride (HCl). With this, oxygen is said to have a combining power number of 2, while hydrogen and chlorine each have a combining power number of 1. This number is sometimes refer to as velency of an element, but the word velency is used to explained how atoms combine as well as how many combine.

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