Question

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The best example for pure substance _____

The most abundant element present in air______

The avagardo number is always equal to______

The valency of sodium is_____

The number of protons present in an atom is called______
Answer all the questions...

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Answer 1

1.Platinum
2.Nitrogen gas
3.6.023*10²³
4.+1
5.atomic number.

Answer 2

1.pure sugar,tin

2.oxygen


3.mole

4.Na


5.atomic no.



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