Question

write down all four Quantum numbers for 19th electron of 24 chromium 21st electron of 21 scandium

Answer 1

The electronic configuration of Chromium-24 is
 1s2, 2s2, 2p6, 3s2, 3p6, 4s1, 3d5

The 19th electron is present in the 4s sub shell,

principal quantum number = 4
azimuthal quantum number = 0
magnetic quantum number = 0
spin quantum number = +1/2
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The electronic configuration of Scandium-21 is,
1s2, 2s2, 2p6, 3s2, 3p6, 4s2, 3d1

The 21st electron of scandium is in 3d sub shell.

principal quantum number= 3
azimuthal quantum number= 2
magnetic quantum number =-2, -1, 0, +1 or +2
spin quantum number = +1/2

:)
 

Answer 2

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