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Who proved that atomic number but not th...

Who proved that atomic number but not the atomic mass is the more proper determining factor of the periodicity of elements?

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CHHAYA PUBLICATION-CLASSIFICATION OF ELEMENTS & PERIODICITY IN PROPERTIES-VERY SHORT TYPE QUESTIONS
  1. Mention the position of the alkali metals in the periodic table.

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  2. Give an example of an element whose atomic mass has been corrected by ...

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  3. Who proved that atomic number but not the atomic mass is the more prop...

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  4. Give an example of d-block element which is not regarded as transition...

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  5. How many rare earth elements are present in the periodic table? Give a...

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  6. Give the common electronic configuration of d-block element.

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  7. Name the transition element having lowest atomic mass.

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  8. Which element gives brick red colouration to the flame? In which block...

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  9. Mention the respective block of the elements having atomic number 7,11...

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  10. What do you mean by repreesntative elements?

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  11. Give two terminal elements of rare earth elements series.

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  12. How will you detect the starting and ending of a period in the periodi...

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  13. Which block contains inner transition elements?

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  14. Give an example of a transition element, which has filled d-subshell i...

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  15. Why the ions or atoms of the transition elements are paramagnetic in n...

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  16. Give an example of a diamagnetic ion.

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  17. Why Fe and Co are called ferromagnetic?

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  18. Which element gives golden-yellow colouration to the flame?

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  19. Why Mg cannot be identified by flame test?

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  20. Which are called 'ntals'?

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