Most natural diamonds have ages between 1 billion and 3.5 billion years. Diamond is the only gem with a single element. Do ...
Chalk is a fine-textured form of limestone. It is composed of several tiny fragments of the calcite shells or skeletons of ...
Valency is the combining power of an element. Elements in the same group of the periodic table have the same valency. The valency of an element is related to how many electrons are in the outer shell.
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