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Valency and Oxidation States

Atoms of elem...

Question

Atoms of elements in a group on the periodic table have similar chemical properties. This similarity is most closely related to the :

A

atomic numbers

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B

atomic masses

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C

number of principal energy levels

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D

number of valence electrons

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Solution

The correct option is D number of valence electrons
The chemical properties of the atoms of elements in a group of the periodic table is most closely related to the number of valence electrons. All the chemical properties can be justified just by the number of valence electrons.

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Similar questions

Q. Elements in the same column/group of the periodic table have similar chemical properties because their atoms have the same_________.

Q. Assertion :Elements belonging to the same group have similar chemical properties. Reason: Elements of a group have same number of valence electrons.

Q. Elements of the same group have similar valance shell electronic configuration. Hence they exhibit similar chemical properties. But elements of the same period have different valencies.

Comment on the above statement.

Q. (a) Explain why:
(i) All the elements of a group have similar chemical properties.
(ii) All the elements of a period have different chemical properties.

(b) The atomic radii of three elements X, Y and Z of a period of the periodic table are 186 pm; 104 pm and 143 pm respectively. Giving a reason, arrange these elements in the increasing order of atomic numbers in the period.

Q. Assertion :In the present form of periodic table, the period number corresponds to the highest principal quantum number of the elements in the period.
Reason: Elements having similar outer electronic configurations in their atoms belong to same period.

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