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atomic number 20 is Calcium. It is in group 2 (2 valence electrons) and period 4 4th energy level). It is an s block element, so the s orbital will be the one being occupied. Thus, the electron configuration is 1s2 2s2 2p6 3s2 3p6 4s2

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Q: What is the correct configuration of the element with atomic number 20?
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