JEE Main 2024 Chemistry question
The number of electrons present in all the completely filled subshells having n = 4 and s = +½ is . (Where n = principal quantum number and s = spin quantum number)
Answer: 16
Solution
The total number of electrons in a shell is 2n² = 32 for n = 4, of which half (n² = 16) have s = +½.