Question:
Which of the following is not a transition metal?
Which of the following is not a transition metal?
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Look for the element with no partially filled d-orbital; it is an s-block alkali metal.
Updated On: Jul 10, 2026
- Cu
- Cr
- Fe
- Na
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The Correct Option is D
Solution and Explanation
Step 1: A transition metal is an element whose atom (or a stable ion) has a partially filled d-subshell.
Step 2: Check each element. Cr \( (3d^5 4s^1) \), Fe \( (3d^6 4s^2) \) and Cu \( (3d^{10} 4s^1) \); Cu forms \( Cu^{2+} (3d^9) \) with a partly filled d-orbital, so all three are transition (d-block) metals.
Step 3: Sodium (Na) has configuration \( 1s^2 2s^2 2p^6 3s^1 \). It is an s-block alkali metal with no d-electrons and no partially filled d-orbital.
Step 4: Therefore Na is not a transition metal, so option (iv) is correct.
Step 2: Check each element. Cr \( (3d^5 4s^1) \), Fe \( (3d^6 4s^2) \) and Cu \( (3d^{10} 4s^1) \); Cu forms \( Cu^{2+} (3d^9) \) with a partly filled d-orbital, so all three are transition (d-block) metals.
Step 3: Sodium (Na) has configuration \( 1s^2 2s^2 2p^6 3s^1 \). It is an s-block alkali metal with no d-electrons and no partially filled d-orbital.
Step 4: Therefore Na is not a transition metal, so option (iv) is correct.
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