What is the electronic configuration of an element represented as 199X?

Chemistry WAEC 1999

What is the electronic configuration of an element represented as 199X?

  • 1s 22s2 2p 5 checkmark
  • 1s22s23s23p3
  • 1s2 2s2 2p 33s2
  • 1s 22s22p 63s23p64s 1

The correct answer is: A

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