The valence electrons of magnesium is different in ........... quantum number.
m
n
l
s
A
s
B
m
C
l
D
n
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Solution
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The configuration of magnesium is 1s22s22p63s2. The outermost electron is in s orbital and is paired. Therefore, for the two electrons in 3s orbital, only s, spin quantum number is different.
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