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How will you detect the starting and end...

How will you detect the starting and ending of a period in the periodic table?

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By electronic configuration.
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CHHAYA PUBLICATION-CLASSIFICATION OF ELEMENTS & PERIODICITY IN PROPERTIES-VERY SHORT TYPE QUESTIONS
  1. What do you mean by repreesntative elements?

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

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

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  4. Which block contains inner transition elements?

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

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

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  7. Give an example of a diamagnetic ion.

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  8. Why Fe and Co are called ferromagnetic?

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

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  10. Why Mg cannot be identified by flame test?

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  11. Which are called 'ntals'?

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  12. Give the electronic configuration of the outermost shell of lanthanide...

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  13. Which of the groups in the periodic table contain all the metallic ele...

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  14. Give the names of the noble gas elements present in the second and fif...

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  15. Mention the name and atomic number of the element present in group 13 ...

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  16. Give the electronic configuration of the fifth element of the first tr...

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  17. Identify the transition element(s): K,Mn,Ca,Cs,Fe,Cu,Pb.

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  18. Name two elements which d not give flame test.

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  19. Which lanthanide elements have only 1 electron in 5d-subhsell?

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  20. Write the outermost electronic configuration of chalcogens.

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