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AIIMS2001Chemistryd and f Block Elements

Which of the following is the correct sequence of atomic weights of the given elements?

Options

  1. ANi > Co > Fe
  2. BFe > Co > Ni
  3. CCo > Fe > Ni
  4. DCo > Ni > Fe

Correct answer

D. Co > Ni > Fe

Step-by-step solution

aligned Fe (Z=26) ; Atomic weight & =55.85 Co (Z=27) ; Atomic weight & =58.93 Ni (Z=28) ; Atomic weight & =58.69 aligned The correct order of atomic weights is CO > Ni > Fe

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