Question

What was the achievement of Dobereiner's triads?

• A. First attempt to study the size of atoms.
• B. First attempt to relate the properties of elements with atomic mass.
• C. First attempt to study the colour of elements.
• D. First attempt to study the atomicity of molecules.

Answer 1

Answer:

B. First attempt to relate the properties of elements with atomic mass.

• Johann Wolfgang Dobereiner, a German scientist, discovered that elements with similar properties may be grouped together in triads (groups of three).

• The chemical and physical properties of the elements in a particular trio were similar.

• Dobereiner’s triads were an early attempt to relate the properties of elements to their atomic masses by grouping them in sets of three elements with similar properties.