Situation : It is 9 a.m. Nathan meets Mr. Henry in the school library. Nathan : Good morning, Mr Henry. Henry : . , Nathan. How’s everything?Nathan : Very well, Sir. What about you?Mr. Henry : I’m fine. Thanks?
Diketahui unsur unsur 15P31, 15Q30 , 15R32, 16S32 . Unsur unsur yang merupakan pasangan isoton adalah?
