Mg2+ and Ca2+ (and many more!)
Calcium has a chrage of +2 or two positive charges
Two ions with a 1+ charge will bond with one ion with a 2+ charge to balance the overall charge in the compound.
The charge on the Sc ions in Sc2O3 is 3+. This can be determined by recognizing that oxide ions always have a charge of 2-, and there are three of them, so the total oxide charge is 6-. There are two scandium ions, and since the compound must be neutral, the total charge on the two scandium ions has to be 6+, so the charge on each scandium ion is 3+.
two elements with ions with a 2 plus charge are Sulfurand Oxygen
Two potassium ions are needed to balance the charge of one sulfide ion. Potassium has a +1 charge and sulfide has a -2 charge, so two potassium ions with a +1 charge each are required to balance the -2 charge of the sulfide ion.
You would need two potassium ions to balance the charge of one sulfide ion. Potassium has a charge of +1, while sulfide has a charge of -2, so two potassium ions with a total charge of +2 would balance the charge of one sulfide ion with a charge of -2.
Two ions with a +1 charge will bond with one ion that has a +2 charge to maintain overall electrical neutrality in the compound.
There are two chloride ions present in a formula unit of magnesium chloride. This is because the magnesium ion has a 2+ charge, requiring two 1- chloride ions to balance the charge in a 1:2 ratio.
Two ions with a +1 charge will bond with one ion with a -2 charge to form a neutral compound. The ratio is determined by the charges on the ions, ensuring that the overall charge of the compound is balanced.
Magnesium typically forms ions with a +2 charge. This means it will lose two electrons to achieve a stable electronic configuration.
The "2" in MgBr2 indicates that magnesium (Mg) forms an ionic compound with two bromide ions (Br-). This means that magnesium will have a 2+ charge to balance the 2- charge of the two bromide ions.
The charge of sulfate ions is 2-.