Which one of the following statements is true regarding the following elements?

They have same atomic number.

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They have same atomic mass.

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They have same valency.

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They have same atomic radii.

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Solution

The correct option is C
They have same valency.

The elements belonging to the same group have same valency.

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Question 07

Two atoms are said to be isobars if ?

(a) They have same atomic number but different mass number

(b) They have same number of electrons but different number of neutrons

(d) Sum of the number of protons and neutrons is same but the number of protons is different

(a) they have different chemical properties

(b) their physical properties are the same

(d) they are isobars of the same element

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