The answer is A I believe, the subscript 2 indicates that there are two magnesium ions for each ion of chlorine. the chloride ion is twice the size of the magnesium ion. magnesium and chlorine form a double covalent bond. there are two chloride ions for each magnesium ion.
It is known that when we write a chemical formula then the subscript present in it represents the number of atoms of an element are participating in the chemical bonding.
For example, as the given compound is .
So here, no subscript is present on magnesium atom which means that its subscript is 1 and chlorine atom has a subscript 2 which means that there are 2 atoms of chlorine are present in .
Therefore, we can conclude that the subscript 2 indicate in the compound that there are 2 chloride ions for each magnesium ion.
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