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In Mendeleev's periodic table some pair ...

In Mendeleev's periodic table some pair of elements do not follow increasing order of atomic weight known as anomalous pair. The correct example of anomalous pair is

A

`Cl,Ar`

B

`Th,pa`

C

`Te,In`

D

`Co,Nb`

Text Solution

Verified by Experts

The correct Answer is:
B
Atomic weight of `Th=232`
Atomic weight of `Pa = 231`.
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A2Z-CLASSIFICATION OF ELEMENTS AND PERIODICITY OF PROPERTIES-Section D - Chapter End Test
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  2. Which of the following statement is correct with respect to the proper...

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  3. The pair of amphoteric hydroxides is

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  4. Which of the following oxides is amphoteric is nature ?

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  5. Which has the highest melting point?

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  6. In which of the following arrangements , the order is not correct acco...

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  7. Which one of the following arrangements represents the correct order o...

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  8. What will be the order of first ionisation energy?

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  9. which of the following configurations represents atoms of the elements...

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  10. The first ionisation potential in electron volts of nitrogen and oxyge...

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  11. The elements which occupy the peaks of ionisation energy curve are

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  12. Which is the correct order of ionic sizes (At, No : Ce=58,Sn=50,Yb=70 ...

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  13. A sudden large jump between the values of second and third ionisation ...

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  14. Which element having the following electronic configuration has minimu...

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  15. Arrange F,Cl,O,N in the decreasing order of electronegativy

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  16. Two elements whose electronegativities are 1.2 and 3.0 the bond formed...

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  17. Among Al(2)O,SiO(2),P(2)O(3) and So(2) the correct order of acid stren...

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  18. The order in which the following oxides are arranged according to decr...

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  19. Be and Al exhibit many properties which are similar. But the two eleme...

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  20. The order of magnitude of ionic radii of ions Na^(+),Mh^(2+),Al^(3+) a...

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  21. The order of the magnitude of first ionisation potentials of Be,B,N an...

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