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How does antimony's electron structure resemble arsenic's?

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A labeled periodic table entry for antimony shows its symbol Sb, atomic number 51, atomic weight 121.76, electron configuration, and name. It is a solid, weakly acidic other metal with a rhombohedral crystal structure at room temperature. — antimony Properties of antimony.

Antimony's electronic structure closely resembles that of arsenic because both elements possess three half-filled orbitals in their outermost shells.1

This shared configuration allows both elements to form three covalent bonds and exhibit +3 and -3 oxidation states. Because they belong to the same nitrogen group (Group 15) of the periodic table, they share these fundamental similarities in their valence electron arrangements.123