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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.


(A) 1. XBr₂.
      2. XO.

(B) The formula unit mass of a substance is defined as the sum of the atomic masses of the atoms present in an ionic compound..
3 5 3
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