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CHEMISTRY

JAMB 2005 - Question 35

Chemistry 2005 JAMB Past Questions - Question 35: What is the valence shell electron configuration of the element with atomic number 17?

Choose the correct answers from the options given.

What is the valence shell electron configuration of the element with atomic number 17?

A: IS²2S² 2P6 3S² 3P4

B: IS² 2S² 2P6 3S² 3P5

C: 2S² 2P6

D: 3S² 3P5

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Correct Answer

Explanation

The element with atomic number 17 is chlorine (Cl). The electron configuration of chlorine is 1s² 2s² 2p6 3s² 3p5. In terms of the valence shell, chlorine has 7 valence electrons, which are in the 3s and 3p orbitals.