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Electronic Configurations MCQ App & e-Book Download - 745

MCQ:

The only element which have electronic configuration of 1s2 is

  1. helium
  2. lithium
  3. beryllium
  4. oxygen

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Electronic Configurations App (Android & iOS)

Electronic Configurations App (Android & iOS)

A level Chemistry App (Android & iOS)

A level Chemistry App (iOS & Android)

9th Grade Chemistry App (Android & iOS)

9th Grade Chemistry App (Android & iOS)

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SAT Chemistry App (iOS & Android)