Question

which ion has a charge of 2+?
a. an ion with 10 protons, 10 neutrons, and 10 electrons
b. an ion with 10 protons, 9 neutrons, and 8 electrons
c. an ion with 8 protons, 9 neutrons, and 10 electrons
d. an ion with 8 protons, 10 neutrons, and 8 electrons

Explanation:

Step1: Recall ion - charge formula

Ion charge = Protons - Electrons

Step2: Calculate charge for option B

Charge = 10 - 8 = 2+

Answer:

B. an ion with 10 protons, 9 neutrons, and 8 electrons