What block is highly reactive element that forms salts with halogens?

The highly reactive element that forms salts with halogens is found in the alkali metals group, specifically in the s-block of the Periodic Table. Elements like sodium (Na) and potassium (K) readily react with halogens, such as chlorine, to form ionic compounds known as salts, like sodium chloride (table salt). Their high reactivity is due to their tendency to lose one electron, making them eager to bond with halogen elements that readily gain electrons.