X,Y and Z are the elements of a Dobereiner's Traid. If the atomic mass X is 7 and that of Z is 39,what should be the atomic mass of Y?

What are the units of Atomic mass ?

Chlorine, bromine and iodine form a Dobereiner's triad . Chlorine has atomic mass 35.5 and iodine has atomic mass 126.9 . Predict the atomic mass of bromine.

The atomic masses of three elements A, B and C having similar chemical properties are 7, 23 and 39 respectively. a. Calculate the average atomic mass of element B according to Dobereiner's triads. b. Compare the average atomic mass of B with its atomic mass. c. What could the elements A, B and C be?

Answer the following questions: In Dobereiner's triad containing Li,Na,K if atomic masses of lithium and potassium are 6.9 and 39.1, then what will be the atomic mass of sodium ?

What is meant by the atomic number (Z) of an element ?

In Dobereiner's triads Li, Na, K, the atomic masses of lithium and potassium are 6.9 and 39.1 respectively, then what will be the atomic mass of sodium?

Two elements X (Atomic mass 16 ) and Y (Atomic mass 14) combine to form compounds A,B andC. The ratio of different masses of Y that combine with fixed mass of X in A,B, and C is 1:3:5. If 32 parts by mass of X combine with 84 parts by mass of Y in B, then in C, 16 parts by mass of X will combine with _____________.

The fractional atomic mass of an element is due to

The scientist who classified elements on the basis of atomic mass.

The simplest formula of a compound containing 50% of x (atomic mass =10)and 50% of element y (atomic mass = 20 ) is