2.Вкажіть правильно записану електронну формулу для атома Кальцію: . a) 1s22s22p63d10s23p64s2; б) 1s22s22p63s23p63d104s2; • B) 1s22s22p63s23p64s2; ● U ● • г) 2542s22p103s23p61s2.
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