Question

If a principle energy level of an atom contains $18$ electrons in the ground state, they will be arranged in orbitals according to the pattern.

• A. $s^6{p}^6{d}^6$
• B. $s^2{p}^6{d}^{10}$
• C. $s^2{d}^6{f}^{10}$
• D. $s^2{p}^6{f}^{10}$
• E. $s^2{p}^2{f}^{14}$

Answer 1

Answer: (B)

$s^2{p}^6{d}^{10}$

If a principle energy level of an atom contains 18 electrons in the ground state, they will be arranged in orbitals according to the pattern $s^2{p}^6{d}^{10}$.
The order of filling of orbitals in given energy level will be s followed by p followed by d.
s, p and d orbitals can accommodate a maximum of 2, 6 and 10 electrons respectively.