The electronic configuration of an atom is 2,8,1.
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The electronic configuration of metal 'A' is 2,8,1. This is electronic configuration of sodium metal. The electronic configuration of metal 'B' is 2,8,2. ... It is not easy for an atom to lose 2 electrons, so magnesium is less reactive than sodium.
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SODIUM HAS THE ELECTRONIC CONFIGURATION OF 2,8,1.
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