Name the element in the nucleus of an atom which contains 11 protons.

This is sodium. Situated in the first column of the periodic table, sodium is a member of the alkali metal family along with potassium (K) and lithium (Li). When combined with chlorine (Cl), these two elements form sodium chloride (NaCl). Sodium is also used as a salt in many fertilizers.

Sodium is used to make glass. Silicon makes up most of the glass. But sodium is also often used in the glass making process. Sodium is also one of the elements used in papermaking.