Which of the following is NOT a characteristic property of transition elements?
Correct answer: D. Low melting points and softness
- A. Variable oxidation states
- B. Formation of complex ions
- C. Catalytic activity
- D. Low melting points and softness
Explanation
Transition metals are hard, dense and high melting, because both the 3d and 4s electrons contribute to metallic bonding, and tungsten melts at over 3400 degrees Celsius. The other three properties all follow from the partly filled d subshell. The soft, low melting, low density metals are those of group I, which is the contrast being tested here.
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About Electronic Structure of d-Block Elements
The electronic structure of d-block elements covers the filling of the (n-1)d and ns orbitals, general electronic configurations, and the exceptions shown by chromium and copper. It explains how partially filled d orbitals produce variable oxidation states, coloured ions, magnetic behaviour and complex formation, while distinguishing transition elements from elements with completely filled d subshells.
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