Answer:
i believe it is titanium.
Explanation:

<u>b. a positive cation and a negative anion</u>
✏ Anions are negative in nature while cations are positive in nature. Together they come together by an attractive electrostatic force to form an ionic bond.
ʰᵒᵖᵉ ⁱᵗ ʰᵉˡᵖˢ

the answer is d. this is due to the fact a proton weighs 2000 times more then a electron