(a),(b) and (c) are elements in the second short period. Oxide of (a) is ionic, that of (b) is amphoteric and of (c) of gaint molecule. (a),(b) and (c) have atomic number in the order-

(X), (Y), (Z) are elements in third short period. Oxide of (X) is ionic, (Y) is amphoteric and (Z) is a giant molecule. (X), (Y) and (Z) will have atomic number in the order :

(X), (Y), (Z) are elements in third short period. Oxide of (X) is ionic, (Y) is amphoteric and (Z) is a giant molecule. (X), (Y) and (Z) will have atomic number in the order :

Three elements, X and Y and Z are present in the third short period and their oxides are ionic, amphoteic and giant molecule respectively. The correct order of atomic number of X, Y and Z is-

Elements A, B and C belong to the same period in the long form of the periodic table. The nature of the oxides of A, B and C is amphoteric basic and acidic respectively. The correct order of the atomic numbers of these elements is

A,B and C are the elements of a Deobereiner's triad. If th atomic mass of A is 7 and that of C is 39, what should be the atomic mass of B ?

X, Y and Z are elements of the same period in the periodic table. 'X' forms an acidic oxide, 'Y' forms a basic oxide and 'Z' forms an amphoteric oxide. Which of the following represents the correct order of increasing atomic numbers?