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hiepgia0493
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
thua thay, em thac mac nhu sau.
Cau 15. dap an co bi nham khong a. M=11=Na, X=17=Cl, Y=9=F, R=19=K. neu xep theo chieu tang cua do am dien thi phai la: R<M<X<Y. nhung d.an la: M<X<Y<R
Cau 15. dap an co bi nham khong a. M=11=Na, X=17=Cl, Y=9=F, R=19=K. neu xep theo chieu tang cua do am dien thi phai la: R<M<X<Y. nhung d.an la: M<X<Y<R