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प्रश्न
There are 14 elements in actinoid series. Which of the following elements does not belong to this series?
पर्याय
U
Np
Tm
Fm
उत्तर
Tm
Explanation:
In the periodic table, actinides lie from atomic number 90 to 103.
Thulium is not an actinide; it is a lanthanide.
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संबंधित प्रश्न
Give a reason for the following:
Actinoids show irregularities in their electronic configurations.
How would you account for the following:
Actinoid contraction is greater than lanthanoid contraction.
With reference to structural variability and chemical reactivity, write the differences between lanthanoids and actinoids
Write one similarity and one difference between the chemistry of lanthanoid and actinoid elements.
Give reasons for the following:
The chemistry of actinoids elements is not so smooth as that of the lanthanoids.
The electronic configuration of Ux+ ion is [Rn]. What is the value of x?
[At. No. of U = 92]
Which among the following elements is radioactive?
Which of the following actinoids show oxidation states upto +7?
(i) Am
(ii) Pu
(iii) U
(iv) Np
What causes actinoid contraction?
Why do actinoids show variable oxidation states?
