Question on: JAMB Chemistry - 2016
The number of electronic shells contained in an atom with electron configuration 1s22s22p63s23p64s2 is
A
3
B
2
C
4
D
5
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Correct Option: C
The electron configuration 1s²2s²2p⁶3s²3p⁶4s² describes the arrangement of electrons in an atom. The numbers in front of the letters (1, 2, 3, and 4) represent the principal quantum number, which corresponds to the energy level or shell. Therefore, the electron configuration shows that electrons are present in the 1st, 2nd, 3rd, and 4th shells.
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