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JAMB Chemistry 2018 Paper

Question : 26

Total: 87

Solution:

Concept:

The valence shell electrons can be obtained from the electron configuration of the element.

Explanation:

Atomic number is

Z = 14

, so the element has 14 electrons.

Its electron configuration is

1s^2\,2s^2\,2p^6\,3s^2\,3p^2

or shell arrangement

2, 8, 4

The outermost shell is the third shell, and it contains

3s^2 + 3p^2 = 4

electrons.

Answer:

4 electrons.

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