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Write names and electronic configurations of elements of first period in the modern periodic table. Identify which of them has the stable complete

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Write names and electronic configurations of elements of first period in the modern periodic table. Identify which of them has the stable complete electronic configuration.

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  • Hydrogen (H) : 1s2, Helium (He) : 2s2
  • Since helium has a complete duplet i.e., two electrons in its valence shell, it has the stable complete electronic configuration.
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