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Questions
Name the radioactive element in lanthanoids.
Write the name of radioactive element in lanthanide series.
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Solution
Promethium (Pm)
RELATED QUESTIONS
The following electronic configuration of elements shows highest oxidation state
Which of the following statements are FALSE about lanthanoids?
(I) They have lower heat of atomization than transition metals
(II) They are soft metals with silvery white colour and densities of about 7 g cm−3.
(III) They react with water to give the metal hydroxide and oxygen gas.
(IV) They form hydroxides, which are covalent and basic.
What is the general molecular formula of the product obtained on reacting lanthanoids (Ln) with nitrogen?
Which is the INCORRECT property of lanthanoids?
Which element among the following lanthanoids has the smallest atomic radius?
What is the value of effective magnetic moment found in +3 oxidation state of Chromium (Z = 24)?
Which element from following forms colourless compounds in +2 oxidation state?
Identify the correct decreasing order of ionic radii of lanthanoids.
Which of the following properties is NOT of lanthanoids?
Which among the following lanthanoids has smallest atomic size?
Give the properties of Lanthanoids.
Which one of the lanthanoids given below is the most stable in divalent form?
Which of the following factors may be regarded as the main cause of lanthanoid contraction?
Which element from following has largest atomic radius?
Give the electronic configuration of gadolinium (Z = 64).
Write expected and observed electron configurations of 58Ce.
Eu (Z = 63) and Yb (Z = 70) show + 2 oxidation state. Explain.
What are the physical properties of lanthanoids?
Write two uses of lanthanoids.
Define actinoid contraction.
