Two elements X and Y have valencies of 5 and 3, and 3 and 2, respectively. The element X and Y are most likely to be respectively :

Two elements X and Y have the same atomic mass but this atomic number are 20 and 21 respectively X and Y are

Two elements X and Y have atomic number 3 and 5 respectively, give the formula of their chlorides.

The element X and Y in the communication system (figure) are respectively

The formula of a compound is X_(3)Y . The valencies of element X and Y will be respectively :

Suppose two elements X and Y combine to form two compound XY_2 and X_2Y_3 weighs 85g . The atomic masses of X and Y are respectively :

Suppose two elements X and Y combine to form two compound XY_2 and X_2Y_3 weigh 85g . The atomic masses of X and Y are respectively :

Suppose two elements X and Y combine to form two compound XY_2 and X_2Y_3 weigh 85g . The atomic masses of X and Y are respectively :