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A)an element x has valency 2 . write the chemical

formula for
1)bromide of the element
2) oxide of the element
B)define formula unit mass of a substance.


Xbr2 and XO

B)The formula mass of a substance is defined as the sum of the atomic masses of constituent atoms in an ionic compound. This is generally used for ionic compounds which do not contain discrete molecules, but ions as their constituent units.
1 5 1
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