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The number of...

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The number of shells in the electronic arrangement of Calcium(20) is equal to 4

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Solution

The correct option is A
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The number of shells in calcium can be found out by writing its electronic configuration. Calcium has an atomic number of 20, which means it carries 20 electrons. There are 2 in the first electron shell, 8 in the second electron shell, another 8 in the third electron shell, and 2 in the fourth and outermost shell of calcium.

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