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 Which of the following group contain mostly radioactive elements ?
  • a)
    Lanthanoids
  • b)
    3 d transition series
  • c)
    4 d transition series
  • d)
    Actinoids
Correct answer is option 'D'. Can you explain this answer?
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Which of the following group contain mostly radioactive elements ?a)La...
The actinoids are said to be most radioactive metals because in this group all the metals have very oxidation number and are very rare metals found on earth and it has all the elements radioactive in its group and it has most radioactive metal uranium in it's group.
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Which of the following group contain mostly radioactive elements ?a)La...
Actinoids

- The actinoids are a series of elements that follow actinium (Ac) in the periodic table. They belong to the f-block of elements and are part of the larger group known as the inner transition metals.
- The actinoid series includes elements from atomic number 89 (actinium) to 103 (lawrencium). These elements are characterized by the filling of the 5f orbitals in their electron configuration.
- The actinoids are highly radioactive elements. This is because they have unstable atomic nuclei that undergo radioactive decay, emitting various types of radiation such as alpha particles, beta particles, and gamma rays.
- The actinoids are known for their radioactivity due to the presence of a large number of unstable isotopes in their nuclei. Some of the actinoids, such as uranium and plutonium, are well-known for their use in nuclear reactors and weapons.
- The radioactive nature of actinoids is due to the fact that their atomic nuclei have an imbalance of protons and neutrons, making them unstable. To achieve stability, these nuclei undergo radioactive decay, which results in the emission of radiation.
- The radioactivity of actinoids is a result of their tendency to undergo transmutation, where one element transforms into another through the emission of radiation. This process occurs as the unstable nuclei of actinoids try to reach a more stable configuration.
- The actinoids exhibit a wide range of radioactive decay modes, including alpha decay, beta decay, and spontaneous fission. This variety of decay modes contributes to their overall high radioactivity.
- Due to their radioactivity, the actinoids pose health risks and require careful handling and storage. Exposure to radioactive actinoids can lead to radiation sickness and other harmful effects on living organisms.
- In conclusion, the actinoids are a group of elements that are highly radioactive. Their radioactivity is a result of their unstable atomic nuclei, which undergo various types of radioactive decay. The actinoids are known for their use in nuclear technology and their potential health hazards.
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Read the passage given below and answer the following questions:The d block elements are the 40 elements contained in the four rows of ten columns (3-12) in the periodic table. As all the d block elements are metallic, the term d-block metals is synonymous. This set of d-block elements is also often identified as the transition metals, but sometimes the group 12 elements (zinc, cadmium, mercury) are excluded from the transition metals as the transition elements are defined as those with partly filled d or f shells in their compounds. Inclusion of the elements zinc, cadmium and mercury is necessary as some properties of the group 12 elements are appropriate logically to include with a discussion of transition metal chemistry. The term transition element or transition metal appeared to derive from early studies of periodicity such as the Mendeleev periodic table of the elements. His horizontal table of the elements was an attempt to group the elements together so that the chemistry of elements might be explained and predicted. In this table there are eight groups labeled I-VIII with each subdivided into A and B subgroups. Mendeleev recognized that certain properties of elements in Group VIII are related to those of some of the elements in Group VII and those at the start of the next row Group I. In that sense, these elements might be described as possessing properties transitional from one row of the table to the next.In the following questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices on the basis of the above passage.Assertion (

Read the passage given below and answer the following questions:The d block elements are the 40 elements contained in the four rows of ten columns (3-12) in the periodic table. As all the d block elements are metallic, the term d-block metals is synonymous. This set of d-block elements is also often identified as the transition metals, but sometimes the group 12 elements (zinc, cadmium, mercury) are excluded from the transition metals as the transition elements are defined as those with partly filled d or f shells in their compounds. Inclusion of the elements zinc, cadmium and mercury is necessary as some properties of the group 12 elements are appropriate logically to include with a discussion of transition metal chemistry. The term transition element or transition metal appeared to derive from early studies of periodicity such as the Mendeleev periodic table of the elements. His horizontal table of the elements was an attempt to group the elements together so that the chemistry of elements might be explained and predicted. In this table there are eight groups labeled I-VIII with each subdivided into A and B subgroups. Mendeleev recognized that certain properties of elements in Group VIII are related to those of some of the elements in Group VII and those at the start of the next row Group I. In that sense, these elements might be described as possessing properties transitional from one row of the table to the next.In the following questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices on the basis of the above passage.Assertion (

Read the passage given below and answer the following questions:The d block elements are the 40 elements contained in the four rows of ten columns (3-12) in the periodic table. As all the d block elements are metallic, the term d-block metals is synonymous. This set of d-block elements is also often identified as the transition metals, but sometimes the group 12 elements (zinc, cadmium, mercury) are excluded from the transition metals as the transition elements are defined as those with partly filled d or f shells in their compounds. Inclusion of the elements zinc, cadmium and mercury is necessary as some properties of the group 12 elements are appropriate logically to include with a discussion of transition metal chemistry. The term transition element or transition metal appeared to derive from early studies of periodicity such as the Mendeleev periodic table of the elements. His horizontal table of the elements was an attempt to group the elements together so that the chemistry of elements might be explained and predicted. In this table there are eight groups labeled I-VIII with each subdivided into A and B subgroups. Mendeleev recognized that certain properties of elements in Group VIII are related to those of some of the elements in Group VII and those at the start of the next row Group I. In that sense, these elements might be described as possessing properties transitional from one row of the table to the next.In the following questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices on the basis of the above passage.Assertion (

Read the passage given below and answer the following questions:Although actinoids are similar to lanthanoids in that their electrons fill the 5f orbitals in order, their chemical properties are not uniform and each element has characteristic properties. Promotion of 5f - 6d electrons does not require a large amount of energy and examples of compounds with ππacid ligands are known in which all the 5f, 6d, 7s, and 7p orbitals participate in bonding. Trivalent compounds are the most common, but other oxidation states are not uncommon. Especially thorium, protactinium, uranium, and neptunium tend to assume the +4 or higher oxidation state. The following questions are multiple choice questions. Choose the most appropriate answer:Q. There are 14 elements in actinoid series. Which of the following element does not belong to this series?

Which of the following group contain mostly radioactive elements ?a)Lanthanoidsb)3 d transition seriesc)4 d transition seriesd)ActinoidsCorrect answer is option 'D'. Can you explain this answer?
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