The species `Ar,K^(+)` and `Ca^(2+)` contain the same number of electrons. In which order do their radii increase ?A. `Ar lt K^(+) lt Ca^(2+)`B. `Ca^(2+) lt Ar lt K^(+)`C. `Ca^(2+) lt K^(+) lt Ar`D. `K^(+) lt Ar lt Ca^(2+)`

The species `Ar,K^(+)` and `Ca^(2+)` contain the same number of electr

1.	The species `Ar,K^(+)` and `Ca^(2+)` contain the same number of electrons. In which order do their radii increase ?A. `Ar lt K^(+) lt Ca^(2+)`B. `Ca^(2+) lt Ar lt K^(+)`C. `Ca^(2+) lt K^(+) lt Ar`D. `K^(+) lt Ar lt Ca^(2+)`
Answer» Correct Answer - C `Al ^(3+), K^(+)` and `Ca^(2+)` are isoelectronic i.e. with same number of electrons. 18. For isoelectronic species ionic radii decreases with increase in effective (relative) positive charge. Also Ar, K and Ca belong to the same period (3rd period).

Discussion

No Comment Found

Related InterviewSolutions

Correct order of 1st ionisationpotential (IP) among following elements Be, B, C, N, O isA. `B lt Be lt C lt O lt N`B. `B lt Be lt C lt N lt O`C. `Be lt B lt C lt N lt O`D. `Be lt B lt C lt O ltN `
Which of the following oxides is not expected to react with sodium hydroxide ?A. `B_(2)O_(3)`B. `CaO`C. `SiO_(2)`D. `BaO`
The correct decreasing order of ionic size among the following species is `K^+, Cl^-, S^-2` and `Ca^(+2)`.A. `Ca^(2+) gt K^(+) gt S^(2-) gt Cl^(-)`B. `Cl^(-) gt S^(2-) gt Ca^(2+) gt K^(+)`C. `S^(2-) gt Cl^(-) gt K^(+) gt Ca^(2+)`D. `K^(+) gt Ca^(2+) gt Cl^(-) gt S^(2-)`
Which one of the elements with the following outer orbital configuration may exhibit the larger number of oxidation states ?A. `3d^(3), 4s^(2)`B. `3d^(5), 4s^(1)`C. `3d^(5), 4s^(2)`D. `3d^(2), 4s^(2)`
The electronic configuration of an element is `1s^(2)2s^(2)2p^(6),3s^(2)3p^(5)`. The atomic number of element present just below the above element in periodic table is:A. 33B. 34C. 36D. 49
Which one of the following arrangements represents the correct order of electron gain enthalpy of the given atomic species?A. `Cl lt F lt O lt S`B. `O lt S lt F lt Cl`C. `F lt S lt O lt Cl `D. `S lt O lt Cl lt F`
`Na^(+), Mg^(2+), Al^(3+)`, and `Si^(4+)` are isoelectronic ions. Their ionic size will follow the orderA. `Na^(+) gt Mg^(2+) lt Al^(3+) lt Si^(4+)`B. `Na^(+) lt Mg^(2+) gt Al^(3+) gt Si^(4+)`C. `Na^(+) gt Mg^(2+) gt Al^(3+) gt Si^(4+)`D. `Na^(+) lt Mg^(2+) lt Al^(3+) ltSi^(4+)`
The species `Ar,K^(+)` and `Ca^(2+)` contain the same number of electrons. In which order do their radii increase ?A. `Ar lt K^(+) lt Ca^(2+)`B. `Ca^(2+) lt Ar lt K^(+)`C. `Ca^(2+) lt K^(+) lt Ar`D. `K^(+) lt Ar lt Ca^(2+)`
The ions `O^(2-), F^(-), Na^(+), Mg^(2+)`, and `A1^(3+)` are isolectronic. Their ionic radii showA. an increase from `O^(2-)` to `F^(-)` and then decrease form `Na^(+)` to `Al^(3+)`B. a decrease form `O^(2-)` to `F^(-)` and then increase form `Na^(+)` to `Al^(3+)`C. a significant increases form `O^(2-)` to `Al^(3+)`D. a significant decrease form `O^(2-)` to `Al^(3+)`
The electronic configuration of four elements are given below. Which element does not belong to the same family as others ?A. `[Xe] 4f^(14), 5d^(10),6s^(2)`B. `[Kr] 4d^(10), 5s^(2)`C. `[Ne] 3s^(2),3p^(5)`D. `[Ar] 3d^(10),4s^(2)`

The species `Ar,K^(+)` and `Ca^(2+)` contain the same number of electrons. In which order do their radii increase ?A. `Ar lt K^(+) lt Ca^(2+)`B. `Ca^(2+) lt Ar lt K^(+)`C. `Ca^(2+) lt K^(+) lt Ar`D. `K^(+) lt Ar lt Ca^(2+)`

Discussion

No Comment Found

Related InterviewSolutions

Reply to Comment