Question

Calcium atoms have 20 protons, but tend to form ions with a 2+ charge. How
many electrons does the ion have? *

Answer 1

Answer: With atomic number 20, calcium atoms have 20 positive protons, and the ion has only 18 electrons, which means the net charge is +2. Calcium ions are essential for muscle contractions, nerve impulses, and bone maintenance.

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Answer 2

Answer:

18 electrons

Explanation:

thats because it loses two to become a cation