Will K Form a Negative Ion?

It would tend to lose two electrons and form a +2 ion. Potassium is in the first column and therefore has 1 electron in its outermost shell. It would tend to lose one electron and form a +1 ion.

Does K form a positive or negative ion?

Potassium forms ions with a positive charge. A compound is formed when potassium reacts with chlorine, which forms ions with a negative charge. The formula of this compound would therefore be KCl. Potassium loses one electron when it reacts with chlorine.

Which of the following elements will form negative ions?

And thus nitrogen, oxygen, fluorine, chlorine, etc. TEND to form negative ions, i.e. N3− , O2− , F− , and Cl− ; clearly the PARENT atoms (or molecules) are oxidizing species.