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प्रश्न
There are 14 elements in actinoid series. Which of the following elements does not belong to this series?
विकल्प
U
Np
Tm
Fm
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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.
Why do actinoids show a wide range of oxidation states?
Write on similarity between the chemistry of lanthanoids and actinoids.
Which is the last element in the series of the actinoids? Write the electronic configuration of this element. Comment on the possible oxidation state of this element.
Compare the chemistry of the actinoids with that of lanthanoids with reference to electronic configuration
What is the position of actinoids in periodic table ?
How would you account the following :
Highest fluoride of Mn is MnF4 whereas the highest oxide is Mn2O7.
How do you prepare:
Actinoid elements show wide range of oxidation states.
Choose the most correct option.
In which of the following series all the elements are radioactive in nature?
Identify the CORRECT statement.
The actinoid contraction is attributed to the ____________.
The number of unpaired f-electrons in ytterbium (Z = 70) is ____________.
Which of the following properties is NOT of actinoids?
Which among the following elements is radioactive?
The inner transition metals of 5f series are known as ____________.
Assertion: Actinoids form relatively less stable complexes as compared to lanthanoids.
Reason: Actinoids can utilise their 5f orbitals along with 6d orbitals in bonding but lanthanoids do not use their 4f orbital for bonding.
The incorrect statement among the following is:
What is actinoid contraction?
