The electronic configuration of two atoms X and Y are as follows: X - 1s...

CHEMISTRYWAEC 1989

The electronic configuration of two atoms X and Y are as follows: X - 1s 2 2s2 2p6 3s 1, Y -1s2 2s2 2p6 3s2 3p6 4s2 which of the statements below is true of the position of X and Y in the Periodic Table?

  • A. x belongs to group 1, Y belongs to period 2,
  • B. x belongs to group 1, Y belongs to period 4
  • C. x belongs to group 2, Y belongs to period 1
  • D. x belongs to group 3, Y belongs to period 2

Correct Answer: B. x belongs to group 1, Y belongs to period 4

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