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Questions and Answers
How are pure substances defined?
Why are different elements/compounds classified together?
How many elements are currently known?
What is the basis for the classification of elements into metals and nonmetals?
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Why are elements grouped together for classification?
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Which metal is the most abundant in the earth's crust?
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In what form are highly reactive metals like sodium and potassium found in nature?
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Which non-metal is found in its free state in the atmosphere?
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In what state does carbon exist as diamond and graphite?
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Which metal is an example of a less reactive metal found in nature in its elemental state?
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