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WAEC Chemistry 2023 Paper
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Question : 38
Total: 50
Which of the following elements has its valence electrons in the s-orbital?
Aluminum
Phosphorus
Sodium
Carbon
Validate
Solution:
Sodium is an alkali metal, and its atomic number is 11 . This means that it has 11 electrons, and its electron configuration is
1
s
2
2
s
2
2
p
6
3
s
1
. The valence electrons are the electrons in the outermost shell, which in this case is the 3s orbital.
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