Q.

Which of the following is true

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a

 All transition elements are metallic, but more electropositive than alkaline earths

b

All actinides are synthetic and radioactive

c

All s-block and all p-block elements are representative elements

d

ll d-block and all f-block elements are metals

answer is D.

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Detailed Solution

  • Elements of d-block and f-block of the periodic table constitute metals
  • p-block consists of metals ,non-metals, semiconductors etc.
  • Uranium is an actinide that occurs naturally.
  • Transition elements due to their smaller atomic size and greater  effective nuclear charge, have higher ionization energy than alkaline  earth metals and hence are less electropositive.

 

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