Atoms at ground states tend to have as many unpaired electrons as possible.
its called maximum capacity, According to Hund's first rule, electrons will fill each empty degenerate orbital with parallel spins before any orbital gets a second electron.
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When assigning electrons to orbitals, an electron first seeks to fill all the orbitals with similar energy
so its also like two elements joining like Table Salt NaCl: Sodium and chlorine
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