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The atomic radii of the elements are alm...

The atomic radii of the elements are almost same of which series

A

`Li - Be - B`

B

`Na - K - Rb`

C

`F - C1 - Br`

D

`Fe - Co - Ni`

Text Solution

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The correct Answer is:
D
`Fe - Co - Ni`. With the increase in the d-electrons, screening effect increases, this counter balances the increased nuclear charge due to increase in atomic number. As a result atomic radii remain practically same after chrmium.
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A2Z-THE D AND F BLOCK ELEMENTS-Section D - Chapter End Test
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  2. In a reaction, the ferrous (Fe^(+ +)) iron is oxidised to ferric (FE^(...

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  3. One of the following metals froms a volatile corbony1 compound and thi...

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  4. The main reason for not using a mercury electrolytic cell in NaOH manu...

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  5. Which of the following statements is not correct about the electronic ...

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  6. Zn and Hg belong to same group, they differ in many of their propertie...

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  7. Which one of the following ionic species will not impart colour to an ...

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  8. The 3d metal ions form coloured compounds because the energy correspon...

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  9. Identify the transition element

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  10. Potassium permanganate acts as an oxidant in neutral, alkaline as well...

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  11. In acidic medium potassium dichromate acts as on oxidant according to ...

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  12. AgCl dissolves in a solution of NH(3) but not in water because

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  13. Verdigris is

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  14. Light green crystals of ferrous sulphate lose water molecules and turn...

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  15. Among TiF(6)^(2-), CoF(6)^(3-), Cu(2)C1(2) and NiC1(4)^(2-) (At. No. T...

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  16. Potassium permanganate works as oxidising agent both in acidic and bas...

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  17. Which method of parification is represented by the following equation...

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  18. Which of the following sulphides when heated strongly in air gives the...

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  19. Guignet's green is known as

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  20. Excess of KI reacts with CuSO(4) solution and Na(2)SO(3) solution is a...

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  21. When concentrated sulphuric acid is added slowly to a solution of ferr...

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