Three elements X, Y and Z are in the 3rd period of the periodic table. The oxides of X, Y and Z, respectivelyThree 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) X < Y < Z (2) Z < Y < X (3) X < Z < Y (4) Y < X < Z