... thu c 10,2 gam oxit M2O3 Tỡm tờn kim loi M Cõu : A l nguyờn t chu kỡ 3.Hp cht ca A vi cacbon cha 25 % cacbon v lng ,v lng phõn t ca hp cht l 144 u.nh tờn nguyờn t A,cụng thc phõn t ca hp cht ... proton, electron v ntron Y l 55 ú s ht mang in nhiu hn s ht khụng mang in l 1,75 ln Hóy xỏc nh s hiu nguyờn t X,Y v s ca Y Cõu 18 : A,B,X l nguyờn t phi kim Tng s ht proton, ntron,electron phõn ... Trungvoclcords T:05002461803 Tng s proton, ntron, elctron l 196 S ht mang in nhiu hn s ht khụng mang in l 60 S ca M nh hn s ca X l Tng s proton, ntron, elctron X nhiu hn ion M3+ l 16 Xỏc nh v trớ...