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Standard XII
Chemistry
Atomic Number and Mass Number
An element ha...
Question
An element has three electrons in the 4th shell, the atomic number of the element is:
A
13
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B
21
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C
27
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D
31
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Solution
The correct option is
C
31
The configuration is
1
s
2
2
s
2
2
p
6
3
s
2
3
p
6
3
d
10
4
s
2
4
p
1
.
Three electrons in the 4th shell is the element Gallium (Ga), atomic number 31.
Hence, option D is correct.
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