Why the elements belonging to the same group do have similar chemical properties?

Why do elements in the same group have similar physical and chemical properties?

State whether the following statement is True' or False'. If false, write the correct statement for the same. Isotopes have similar chemical properties .

Give scientific reasons : Elements belonging to the same group have the same valency

Identify dobereiner's traids from the following group of elements having similar chemical properties : Be(9.0),Mg(24.3),Ca(40.1)

Identify dobereiner's traids from the following group of elements having similar chemical properties : S(32.1),Se(79.0),T(127.6)

Identify dobereiner's traids from the following group of elements having similar chemical properties : Mg(24.3),Ca(40.1),Sr(87.6)

Answer the following questions: Identify Dobereiner's triads from the following groups of elements having similar chemical properties: Mg(24.3),Ca(40.1),Sr(87.6) S(32.1),Se(79.0),Te(127.6) Be(9.0), Mg(24.3), Ca(40.1).

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?

Does a semiconductor diode and resistor have similar electrical properties?

The following group of elements have similar chemical properties.Identifiy with reason wheter it is a Dobereiner's traid N(14.00),P(30.9),As(74.9).