Calcium is element number 20 on the Periodic Table. As an ion it has a +2 charge. How many electrons does a calcium ion have?A4B18C22D20
Question
Calcium is element number 20 on the Periodic Table. As an ion it has a +2 charge. How many electrons does a calcium ion have?A4B18C22D20
Solution
Calcium, as an element, has 20 electrons because its atomic number is 20. However, when it becomes an ion with a +2 charge, it loses 2 electrons. This is because a positive charge on an ion indicates a loss of electrons. Therefore, a calcium ion would have 20 - 2 = 18 electrons. So, the answer is B18.
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