Which of the following can form Dobereiner’s triads with lithium (atomic mass = 6.9 u) and sodium (atomic mass = 23 u)? Options: A . &nbspSulphur, atomic mass = 32 u B . &nbspChlorine, atomic mass = 35 u C . &nbspCalcium, atomic mass = 40 u D . &nbspPotassium, atomic mass = 39 u

Answer: Option D : D Dobereiner arranged elements in groups of three, called triads,in the increasing order of their atomic masses. In a triad, the atomic mass of the middle element was roughly equal to the average of the atomic masses of the other two elements. From the given options, the only element that can form aDobereiner's Triad, along with lithium and sodiumis only pottassium. If A, B and C are Dobereiner's Triads, Atomic mass of B = Atomic mass of A + Atomic mass of C 2

Which of the following can form Dobereiner’s triads with lithiu

Question

Which of the following can form Dobereiner’s triads with lithium (atomic mass = 6.9 u) and sodium (atomic mass = 23 u)?

Options:

A . Sulphur, atomic mass = 32 u

B . Chlorine, atomic mass = 35 u

C . Calcium, atomic mass = 40 u

D . Potassium, atomic mass = 39 u

Answer: Option D
:
D

Dobereiner arranged elements in groups of three, called triads,in the increasing order of their atomic masses. In a triad, the atomic mass of the middle element was roughly equal to the average of the atomic masses of the other two elements.