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Which of lanthandies is man-made element...

Which of lanthandies is man-made element?

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Promethium `(Pm)`m,atomic number `61`, is man-made element.
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CENGAGE CHEMISTRY-APPENDIX - INORGANIC VOLUME 1-Exercise very short
  1. To which series man-made elements belong?

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  2. What is meant by lanthanides and actinides?

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  3. Which of lanthandies is man-made element?

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  4. What are inner transition metals? Why are they called rare earth metal...

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  5. Give general electronic configuration of f-block elements.

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  6. Which orbitals are filled with electrons in 3rd period?

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  7. Give general electronic configuration of least reactive group. Why are...

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  8. Which of the following requires highest energy: a.M((g)) rarr M((g))...

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  9. How do atomic radii vary (a) down the group and (b) along the period f...

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  10. Define (a) ionic radii and (b) covalent radii.

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  11. Why do noble gases have bigger atomic size than halogens?

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  12. Define ionisation energy.

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  13. How does ionisation energy vary (a) down the group and (b) along the p...

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  14. A and B belong to same group of periodic table. A has higher atomic nu...

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  15. The problem of position of isotopes in the periodic table was avoided ...

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  16. Two different elements may have same mass number but not the same .

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  17. When compared to lithium, it is easier to remove valence electron from...

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  18. Chlorine has electron affinity than fluorine.

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  19. Among (the non-radioactive) halogens the element that has the lowest e...

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  20. Name the radioactive element of group 17 and group 18 .

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