2. write the chemical symbol for the ion with 12 protons and 10 electrons
steam
3. write the chemical symbol for the ion with 74 protons and 68 electrons.
4. write the chemical symbol for the ion with 95 protons and 89 electrons.
yyy

2 = Mg⁺²

3 = W⁺⁶

4 = Am⁺⁶

Explanation:

2= Magnesium have twelve electrons and twelve protons. The atomic number of magnesium is 12 and atomic mass is 24 u. In given statement number of electrons are ten which means two valence electrons of magnesium are lost by magnesium atom and present in the form of cation Mg⁺².

3 = Tungesten have seventy four electrons and seventy four protons. The atomic number of tungesten is 74 and atomic mass is 183.84 u. In given statement number of electrons are sixty eight which means six  electrons of tungesten are lost by tungesten atom and present in the form of cation W⁺⁶.

4 = Americium have ninety five electrons and ninety five protons. The atomic number of Americium  is 95 and atomic mass is 243 u. In given statement number of electrons are 89 which means six electrons of Americium are lost by Americium atom and present in the form of cation Am⁺⁶.

the formula would be mgso4

mgso[subscript]4