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You can calculate the total capacity of an electron shell using the formula 2n2,

... electron shell, it would need 10 electrons: 2 to fill the 1st shell and 8 to fill the

2nd. ... In other words, in an atom with 20 electrons (which is the element calcium

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How many electron shells does the largest atom have?

The largest atom is calcium which has 4 shells.


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A neutral atom of calcium has 20 electrons arranged in the electron shells. The electron configuration for calcium is 2-8-8-2. The first two shells (K and L) are completely filled, while the M shell is partially filled with 2 electrons.


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