Question

An element A having the electronic configuration (2, 8 ,2) combines with an element B having an electronic configuration (2,7). How many atoms of an element A combine with an atom of element B
Write down its chemical formula.
What would be the chemical formula of an oxide of A ?

Answer 1

Explanation:

A: 2,8,2 - 12 - Magnesium

B: 2,7 - 9 - fluoride

therefore: the chemical equation = Mg+ 2F = MgF₂

no. of atoms of A: 1

no. of atoms of B: 2

chemical formula: MgF₂

oxide of A: MgO

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