Answer quickly, i don't understand how to do this properly. potassium forms ions with a charge of +1 (ka+). iodine forms ions with a charge of -1. selenium forms ions with a charge of -2 ( imagine that potassium ions and selenide ions combine to form potassium selenide. what numbers would be in the place of x and y in: kxsey (use the number 1 even if it isn't strictly necessary)

Answer :  2 and 1 are the numbers in the place of X and Y in .

Explanation :

Crisscross method : It is a method of finding a chemical formula in which ionic bond is formed by combining of metal and non-metal.

The charge on Potassium ion is +1 and the charge on Selenide ion is -2.

The potassium ions combined with the selenide ions to form a Potassium selenide. Image is also show below.

According to the crisscross method,

The formula of Potassium selenide is .

Therefore, 2 and 1 are the numbers in the place of X and Y in .

the electronic configuration of an atom with eight electrons is 1s²2s²2p⁴. the orbital diagrams are shown in the figure.

as per the hunds rule:

1. electrons tend to avoid being in the same orbital as per as practicable.

2. electrons in different orbitals of the same energy will have their spin parallel.

this can be illustrated from the multiplicity of the orbitals of the atom. as there are four electrons in the p orbital and p orbital has 3 sub-shells. the electrons can be fed in different ways as shown in the figure but the correct orbital diagram will be as per the hunds rule.