Atomic Masses Three Elements And Having Similar Chemical Properties Are And Respectively

The atomic masses of three elements X, Y and Z having similar chemical properties are 7, 23 … which can be classified according to…


(a)  Average atomic mass =  (Mass X + Mass of Z)/2 =  (7 + 39)/2 = 23

(b) The average atomic mass of elements X and Z is equal to the atomic mass of element Y.

(c) Dobereiner’s law of triads.

(d) X is lithium, Y is sodium and Z is potassium.

(e) Chlorine, Bromine, Iodine.