•c(calcio) 4s²
•h(hidrogeno) 1S¹, (hierro) 3d6 4s2, (helio) 1s2
•o(oxigeno) 2s², 2p⁴
•n(nitrogeno) 2s2 2p3
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•c(calcio) 4s²
•h(hidrogeno) 1S¹, (hierro) 3d6 4s2, (helio) 1s2
•o(oxigeno) 2s², 2p⁴
•n(nitrogeno) 2s2 2p3