All atoms of a given element have identical ______ including identical _____

Which of the following statement is correct?

Charaka Samhita is the oldest known book of Ayurvedic in India.

Calculate the mass percent of magnesium in the formation of magnesium oxide.

What are the basic constituents of matter?

Which of the following may be an incorrect statement?

Candela is the S.I. unit of _____

A mole of any substance contains ___