science
Grade-9
Easy
Question
How many numbers of electrons are there in the 3rd shell of phosphorus?
- 5
- 8
- 7
- 6
Hint:
The number of electrons in the 3rd shell is 5.
The correct answer is: 5
- The atomic number of phosphorous is 17.
- The electron configuration is 2,8,5 in the K shell, L shell, and M shell respectively.
- As the M shell is the 3rd shell, the number of electrons is 5
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