JEE Main 2020 · 3 September · evening · Single correct · +4 / −1

Consider the hypothetical situation where the azimuthal quantum number, l, takes values 0, 1, 2, ....., n + 1, where n is the principal quantum number. Then, the element with atomic number :

  1. (a) 13 has a half-filled valence subshell
  2. (b) 9 is the first alkali metal
  3. (c) 8 is the first noble gas
  4. (d) 6 has a 2p-valence subshell
Answer and solution

Answer (a) 13 has a half-filled valence subshell

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Asked about 170 times in JEE Main since 2020. This question is from 2020.