Indicar el grupo y período de un elemento cuyo Z=21.
A) 4, III-A
B) 4, II-A
C) 4, III-B
D) 4, IV-A
E) 4, IV-B
A) 4, III-A
B) 4, II-A
C) 4, III-B
D) 4, IV-A
E) 4, IV-B
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hola gracias por los puntos