The species Ar, K⁺ and Ca²⁺ contain the same number of electrons. In which order do their radii increase?

Ar < K⁺< Ca²⁺

Ca²⁺ < Ar < K⁺

Ca²⁺ < K⁺ < Ar

K⁺< Ar < Ca²⁺

Solution

Ca²⁺ < Ar < K⁺

Ca²⁺ < K⁺ < Ar
Ar, K⁺ and Ca²⁺ are isoelectronic i.e with the same number of electrons, 18. For isoelectronic species, ionic radii decrease with increases in effective (relative) positive charge. Also Ar, K and Ca belong to the same period.

Some More Questions From Classification of Elements and Periodicity in Properties Chapter

Which property is the basis of long form of periodic table?

How many elements are placed in each period of the p-block?

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Classification Of Elements And Periodicity In Properties

The species Ar, K⁺ and Ca²⁺ contain the same number of electrons. In which order do their radii increase?

Ar < K⁺< Ca²⁺

Ca²⁺ < Ar < K⁺

Ca²⁺ < K⁺ < Ar

K⁺< Ar < Ca²⁺

Some More Questions From Classification of Elements and Periodicity in Properties Chapter

Which property is the basis of long form of periodic table?

How many elements are placed in each period of the p-block?

What is the number of groups in: (i) p-block (ii) d-block?

How many elements are present in:
(i) second period
(ii) fourth period
(iii) sixth period?

What is the name given to the s-block elements?

To which block the element with outer electronic configuration 4s²3d¹⁰ belongs?

Why are there 10 elements in each series of d-block?

In terms of electronic configuration,
what is common in a given period and group?

Give the general electronic configuration of
(i) Transition elements (ii) Inner transition elements.

Name the group and period to which an element with Z = 15 belongs ?

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Classification Of Elements And Periodicity In Properties

The species Ar, K+ and Ca2+ contain the same number of electrons. In which order do their radii increase? Ar < K+< Ca2+ Ca2+ < Ar < K+ Ca2+ < K+ < Ar K+< Ar < Ca2+

Some More Questions From Classification of Elements and Periodicity in Properties Chapter

Which property is the basis of long form of periodic table?

How many elements are placed in each period of the p-block?

What is the number of groups in: (i) p-block (ii) d-block?

How many elements are present in:(i) second period (ii) fourth period (iii) sixth period?

What is the name given to the s-block elements?

To which block the element with outer electronic configuration 4s23d10 belongs?

Why are there 10 elements in each series of d-block?

In terms of electronic configuration, what is common in a given period and group?

Give the general electronic configuration of(i) Transition elements (ii) Inner transition elements.

Name the group and period to which an element with Z = 15 belongs ?

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

The species Ar, K⁺ and Ca²⁺ contain the same number of electrons. In which order do their radii increase?

Ar < K⁺< Ca²⁺

Ca²⁺ < Ar < K⁺

Ca²⁺ < K⁺ < Ar

K⁺< Ar < Ca²⁺

How many elements are present in:
(i) second period
(ii) fourth period
(iii) sixth period?

To which block the element with outer electronic configuration 4s²3d¹⁰ belongs?

In terms of electronic configuration,
what is common in a given period and group?

Give the general electronic configuration of
(i) Transition elements (ii) Inner transition elements.