JEE PYQ: Atomic Structure Question 18
Question 18 - 2020 (03 Sep Shift 2)
Consider the hypothetical situation where the azimuthal quantum number, $\ell$, takes values $0, 1, 2, \ldots, n+1$. Then, the element with atomic number:
(1). (9 is the first alkali metal)
(2). (13 has a half-filled valence subshell)
(3). (8 is the first noble gas)
(4). (6 has a 2p-valence subshell)
Show Answer
Answer: (2)
Solution
With modified rules, filling order gives Atomic number 13: $1s^2 1p^6 1d^5$ – half-filled valence subshell.
BETA
