1.

Three elements X, Y and Z are in the 3rd period of the periodic table. The oxides of X, Y and Z, respectively, are basic, amphoteric and acidic. The correct order of the atomic numbers of X, Y and Z is :(1) Z < Y < X (2) X < Z < Y (3) X < Y < Z (4) Y < X < Z

Answer»

Answer is (3) X < Y < Z

When we are moving from left to right in a periodic table acidic character of oxides increases (as well as atomic number of atom increases)

X < Y < Z (acidic character) 

X < Y < Z (atomic number)



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