The vapour density of a chloride of an element is 39.5. The Ew of the elements is 3.82. The atomic weight of the element is

Mw of metal chloride (MClx) = M  + x × 35.5= 2 × VD = 2 ×39.5 = 79.0Mw = Ew ×xValency of metal = xAtomic weight of element = Ew × xMClx = 3.82 × x + x ×35.5 = 79x = 793.82+35.5≈2Atomic weight = Ew × x = 3.82 ×2 = 7.64