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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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obb obb
wrote...
11 years ago
Using the formula 2n2, 3rd energy level can hold a maximum of 18 electrons. But how can we know how many electrons will a given element have in its 3rd shell?
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wrote...
#1
11 years ago
The Electrons in the outer energy level is dependent on the location of the element in the periodic table.
wrote...
#2
11 years ago
1st shell: 2
2nd shell: 8

so any atomic number above 10 has 3rd shell electrons

example: element 12 has 2
wrote...
#3
11 years ago
Well there is no concept behind this logic. So it has to be memorized.
wrote...
#4
11 years ago
take example of magnesium. it has 12 electrons in total.
use the 2n2 formula and fin out no. of electrons in 1st shell.it  can accommodate only 2 electrons.So out of 12, 2 is in the 1st shell.
similarly, the second can take 8 electrons. out of the remaining 10 electrons(2 electrons  in 1st), 8 electrons  are in 2nd shell.
so there are 2 more electrons left.Those  would be in the 3rd shell
wrote...
#5
11 years ago
The third shell can have one s orbital, three p orbital and five d orbital. Each orbital has the capacity of 2 electrons. So the third shell can accomadate18 electrons.But filling of the 3d orbital is starting for elements in 4th period onwards
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