In a salt what charge does the halogen element have when it gains an electron?

In a salt halogen element have negative charge if it gain an electron.

Explanation:

Fluorine,chlorine, bromine and iodine belongs to the family of halogen elements.These elements have high tendency to acquire electron due their high electronegativity.

      When a halogen element forms a salt for example potassium chloride(KCl), the Cl or chlorine is a halogen element which get negative charge when it gains or acquires an electron.

nuclear fission produces elements that are heavier than helium.

the elements that are used in nuclear fission and their products are much heavier than helium.