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प्रश्न
Name the radioactive element in lanthanoids.
Write the name of radioactive element in lanthanide series.
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उत्तर
Promethium (Pm)
संबंधित प्रश्न
Explain the trend in an Oxidation state of 3d elements.
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.
The electronic configuration of transition element 'X' in +3 oxidation state is [Ar] 3d4. What is its atomic number?
Which statement(s) is/are CORRECT about applications of lanthanoid metals/ions and their compounds?
(I) The optoelectronics applications use lanthanoid ions as active ions in luminescent materials.
(II) Lanthanoid compounds are used in television tubes.
(III) Lanthanoids are used in hybrid cars, superconductors and permanent magnets.
The only radioactive element among the lanthanoids is ____________.
When lanthanoids (Ln) are heated to about 2800 K with carbon, the carbides with general formula ____________ are obtained.
What is the general molecular formula of the product obtained on reacting lanthanoids (Ln) with nitrogen?
What is the value of effective magnetic moment found in +3 oxidation state of Chromium (Z = 24)?
The observed electronic configuration of promethium (atomic number 61) is ____________.
Identify the correct decreasing order of ionic radii of lanthanoids.
Give the properties of Lanthanoids.
Lanthanoids and actinoids resemble in ______.
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).
Eu (Z = 63) and Yb (Z = 70) show + 2 oxidation state. Explain.
What are the physical properties of lanthanoids?
Define actinoid contraction.
Which from following is a lanthanoid element?
