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GK QUESTION#3312

Which of the following options are all transition metals?

  1. AHe, Ne, Ar, Au
  2. BF, Cl, Br, I
  3. CCu, Fe, Ni, TiCorrect answer
  4. DNa, Mg, Al, Mn
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Answer

C. Cu, Fe, Ni, Ti

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Explanation

Copper, iron, nickel and titanium are transition metals: their atoms or commonly formed cations have an incompletely filled d subshell. Copper qualifies through ions such as Cu²⁺. Each other option includes noble gases, halogens or main-group metals, so those sets are not all transition metals.

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