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What period does the element having an electron configuration of 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 belong to?
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What does space concept mean in international relations?
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What period does the element having an electron configuration of 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s...
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