The Modern Atomic Theory Answers

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1
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Longhand notation:

A
1s22s22p63s23p4
B
1s22s22p63s1
C
1s22s22p63s23p64s23d3
D
1s22s22p3
2
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Iron (Fe): [Ar]4s23d6

A
longhand notation
B
noble-gas notation
3

Argon (Ar): [Ne]3s23p6

A
longhand notation
B
noble-gas notation
4

Magnesium (Mg): 1s22s22p63s2

A
longhand notation
B
noble-gas notation

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