The number of shells in calcium is:
Correct answer: C. 4
- A. 3
- B. 2
- C. 4
- D. 5
Explanation
Calcium has an atomic number of 20, which means it has 20 electrons. There are 2 electrons in the first shell, 8 electrons in the second shell, another 8 electrons in the third shell, and 2 in the fourth shell of calcium. Since it has two electrons in its last shell, we consider it as a group 2 element, i.e. an alkaline earth metal.
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