How many shells in calcium atom are filled with electrons?

Two

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Three

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Four

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Five

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Solution

The correct option is C Four

The number of shells in calcium can be determined by writing its electronic configuration. 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 (outermost) shell of calcium.
Its electronic configuration can be written as 2, 8, 8, 2. The number of shells in calcium which are filled with electrons are 4.

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