Answer:
280 electrons
Explanation:
The number of electrons in each energy level are determine by using following formula:
2n²
Here "n' is the energy level. we will put the energy level number in place of "n" and number of electrons will easily found.
Principle energy levels number of electrons
1 2n² = 2(1)²= 2
2 2n² = 2(2)²= 8
3 2n² = 2(3)²= 18
4 2n² = 2(4)²= 32
5 2n² = 2(5)²= 50
6 2n² = 2(6)²= 72
7 2n² = 2(7)²= 98
So the total number of electrons in first seven energy levels will be the sum of the number of electrons in each energy levels.
2+8+18+32+50+72+98 = 280 electrons
