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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
Give the electronic configuration of europium (Z = 63).
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.
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?
The observed electronic configuration of promethium (atomic number 61) is ____________.
Identify the correct decreasing order of ionic radii of lanthanoids.
Which of the following properties is NOT of lanthanoids?
Lanthanoids and actinoids resemble in ______.
The most basic hydroxide from the following is:
Identify the last element in lanthanoid series.
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.
Which from following is a lanthanoid element?
