Give reasons why?
1. Elements have been classified.
2. Noble gases have zero valency.
3. Metals shows positive valency while non-
metals shows negative valency.
4. Mercury is used in thermometers.
5. All elements are pure substances.
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Answer:
Explanation:
Elements have been classified for the identification and because of there different nature
Noble gases has zero valency because of their complete octet .
Metal show positive valency as they donate electron s and non metals accept so they have negative valency
Mercury is a metal which is present in liquid form can rise and fall easily
All element are not pure some are found in nature in pure state and cannot react with any substance
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