Electrons and the Periodic Table Answers

Potassium (K): 1s22s22p63s23p64s1

Iron (Fe): [Ar]4s23d6

Argon (Ar): [Ne]3s23p6

Magnesium (Mg): 1s22s22p63s2

Iron (Fe): [Ar]4s23d6 core electrons

valence electrons

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Question text not available

⇒ 1 valence electrons