Open Question: Anyone, Anyone at all have the explanation to this answer.?

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4 Which statement describes the relative energy of the electrons in the shells of a calcium atom? (1) An electron in the first shell has more energy than an electron in the second shell. (2) An electron in the first shell has the same amount of energy as an electron in the second shell. (3) An electron in the third shell has more energy than an electron in the second shell. (4) An electron in the third shell has less energy than an electron in the second shell. Ok, i know the answer is 3 but why.

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