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Because Nickel is a transition metal that has more than one oxidation number (or charge) whereas magnesium always has a +2 charge.

Answer: Because nickel is a transition metal.

Explanation:

We are given two compounds named as magnesium nitrate [tex](Mg(NO_3)_2)[/tex] and Nickel (II) nitrate [tex](Ni(NO_3)_2)[/tex]

Both the compounds are ionic compounds and its naming is done as follows:

  1. Positive is written first.
  2. The negative ion is written next and a suffix is added at the end of the negative ion. The suffix written is '-ide'.
  3. If the metal ion is a transition metal, then the oxidation state is written in roman numerals inside the bracket. This is so done because transition metals show variable oxidation states.

Hence, [tex]Mg(NO_3)_2[/tex] is written as magnesium nitrate and [tex]Ni(NO_3)_2[/tex] is written as Nickel (II) nitrate due to variable oxidation state shown by transition metals.

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