Which of the following elements will tend to form an anion?

A. Aluminum

B. Beryllium

C. Copper

D. Silicon

E. All of the Above

Metals usually form cations because they like to lose electrons to get a full octet.

Nonmetals usually form anions because they like to gain electrons to get a full octet.

Aluminum will lose 3 electrons to form a cation

Beryllium will lose 2 electrons to form a cation

Copper can lose either 1 or 2 electrons to form a cation.

Silicon can gain 4 electrons to form an anion.

Your correct answer is silicon.