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Jul 28, 3:30 PM

scandium ka atomic number 21 hai, electronic configuration [Ar] 4s² 3d¹. last electron 3d¹ mein jaayega, so quantum numbers honge: n=3, l=2 (d-orbital), m=0 (kyunki first electron d-subshell mein +2 se start karta hai), s=+1/2. yeh yaad aaya jab main neend mein periodic table dekh raha tha, pg ke chotu se room mein, aur socha ki yeh quantum numbers mere life ke variables jaisa hai – fixed, predictable, aur thakaan bhari.
#exams#study

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