Question

formula of magnesium sulphate by criss cross method

Answer 1

The formula of magnesium sulphate is MgSO₄.

Answer 2

The formula of magnesium sulfate by the criss-cross method.

Explanation:

• To write the formula of the compound by criss-cross method, the symbol, as well as the valency of the constituents elements, is required.
• Accordingly, magnesium sulfate is an ionic compound because magnesium is metal whereas sulfur is a non-metal. Thus the given compound is an ionic compound.
• When the constituents elements present in magnesium sulfate is written along with its valency as follows it gives:

Symbol:  Mg     $SO_4$

Valency: $2^-$       $2^+$

• As a negative charge and positive charge of same number is present, it gets cancelled.
• Thus when the symbol and valency are cross multiplied it leads to the formula as $MgSO_4$.

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