Give reasons why?1. Elements have been classified.2. Noble gases have

1.	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.
Answer» 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

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.

Answer»

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