2. XC12 is the chloride of metal X. The formulae of its sulphate is​

XSO₄

Explanation:

XCl₂ is the chloride of metal X. The sum of the charges of the cation and the anion must be zero because the salt is electrically neutral. The charge of  the cation of X is:

1 × X + 2 × Cl = 0

1 × X + 2 × (-1) = 0

X = +2

X has a charge +2 and sulphate (SO₄²⁻) a charge -2. The neutral salt they form is XSO₄.

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explanation:

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the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.