Question

1 .State any four physical properties of metals.
2 .Write any two limitations of Dobereiner classification.​

Answer 1

Answer:

Physical Properties of Metals

• Shiny (lustrous) in nature.

• Metal is a good conductor of electricity and heat.

• Density and melting point is high.

• Mouldable (Malleable)

• Ductile.

• At room temperature, it is in solid form except for mercury.

• Opaque.

Two important limitations are: All known elements could not be classified into groups of triads on the basis of their properties . Not all groups obeyed the Law of Triads. For example, nitrogen family does not obey the Law of Triads.

Answer 2

Answer:

• Shiny (lustrous) in nature.
• Metal is a good conductor of electricity and heat.
• Density and melting point is high.

• Mouldable

    2.Two important limitations are: All known elements could not be classified into groups of triads on the basis of their properties . Not all groups obeyed the Law of Triads. For example, nitrogen family does not obey the Law of Triads.