Answer:
two (2)
Step-by-step explanation:
Potassium is one of the alkali metals represented by the symbol K. It belongs to group 1A of the periodic table and has a charge of +1.
Sulphide is a negatively charged ion of element sulphur. It is represented as
as it has 2 negative charges.
In order to balance, we need equal number of positive and negative charges.
Negative charge = -2
Positive charge = +1
Therefore, we need 2 positive charges and hence 2 Potassium ions.
It is concluded that 2 Potassium ions are required to balance the sulphide ion.