which of the following is considered a cation? n n3- ca2+ ca

Explanation:

Step1: Define a cation

A cation is a positively - charged ion.

Step2: Analyze each option

• N is a neutral nitrogen atom.
• $N^{3 - }$ is a negatively - charged nitride ion (anion).
• $Ca^{2+}$ is a calcium ion with a + 2 charge, which is a cation.
• Ca is a neutral calcium atom.

Answer:

$Ca^{2+}$