The two elements which will form positive ions with +2 charge are magnesium and beryllium.
How cations will form?
Cations will be formed when atoms loses their electrons from the outermost shell to get stability, so that they will get positive charge on itself.
- Oxygen has the atomic number 8 and number of electrons in different shells is 2,6 so that it will gain two electrons and show -2 charge.
- Atomic number of magnesium is 12 & number of electrons in different shells is 2,8,2 so that it will gain loss electrons and show +2 charge.
- Atomic number of beryllium is 2 & number of electrons in different shells is 2,2 so that it will gain loss electrons and show +2 charge.
- Atomic number of sulphur is 16 & number of electrons in different shells is 2,8,6 so that it will gain electrons and show -2 charge.
Hence magnesium and beryllium will show +2 charge.
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