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The atomic number of an element whose cation, X2+, has the ground state electronic configuration...

Chemistry
JAMB 1985

The atomic number of an element whose cation, X2+, has the ground state electronic configuration 1s22s22p63s22p6 is?

  • A. 16
  • B. 18
  • C. 20
  • D. 22
  • E. 24
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Correct Answer: Option C
Explanation

-The main difference between ground state and excited state is that ground state is a state where electrons in a system are in the lowest possible energy levels whereas excited state is any state of the system that has a higher energy than the ground state.

-Calcium atoms have 20 electrons and the shell structure is 2.8. 8.2. The ground state electron configuration of ground state gaseous neutral calcium is [Ar]


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Project Topics and Materials, Post-UTME past questions - Download now or upload yours to get paid
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