Chemistry 5070 · O Level · Atomic structure and the Periodic Table

Atomic structure and the Periodic Table — practice question

X, Y and Z are chemical elements. X and Y are located in the same period of the Periodic Table. Y and Z are located in the same group of the Periodic Table. What could be the electronic configurations of X, Y and Z?

  • AX: $2,4$; Y: $2,7$; Z: $2,8,4$
  • BX: $2,4$; Y: $2,7$; Z: $2,8,7$
  • CX: $2,4$; Y: $2,8,4$; Z: $2,8,7$
  • DX: $2,8,4$; Y: $2,8,7$; Z: $2,4$

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