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Which of the following is a man made ele...

Which of the following is a man made element ?

A

Ra

B

Fr

C

Rn

D

Lr.

Text Solution

Verified by Experts

The correct Answer is:
B
Francium is a man made element.
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DINESH PUBLICATION-THE ALKALI METALS-RQ
  1. The valence shell electronic configuration of alkali metals is

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  2. The strongest reducing agent out of Na, K, Rb and Cs is

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  3. Which of the following is a man made element ?

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  4. Which one of the these is basic ?

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  5. Which one of these is most reactive ?

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  6. Alkali metals are generally extracted by

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  7. Which of the following statements is incorrect ?

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  8. Which one of the elements reacts directly with nitrogen to form nitrid...

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  9. Identify the correct statement

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  10. Which one of the following has highest electropositive character ?

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  11. The electronic configuration of metal M is 1s^(2)2s^(2)2p^(6)3s^(1). T...

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  12. Certain characteristics lithium differ from those of other alkali meta...

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  13. The stability of the following alkali metal chlorides follows the orde...

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  14. Which of the following has the highest melting point ?

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  15. When CO is passed over solid NaOH heated to 200^(@)C , it forms

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  16. When a substance a reacts with water, it produces a combustible gas B ...

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  17. The metal extracted by electrolysis of its fused salt is

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  18. Which of the following has the highest conductivity ?

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  19. Cs^(+) ions impart violet colour to Bunsen flame. This is due to the f...

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  20. Which of the following electronic configuration corresponds to an ele...

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