a) 20 Calcio :182, 282, 2p6, 352, 3p6, 4s2 b) 7 Nitrógeno: 1s2 252 2p3 c) 10 Neon = 152 252 2p6 d) 13 Aluminio = 1s2 282 2p6 352 3p1 e) 2 Helio = 152
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sabe ya fuerte solo dame 5 estrellas