MHT CET · Chemistry · d and f Block Elements
Which among following properties of lanthanoids is NOT true?
- A These are good conductors of heat and electricity
- B These are strongly paramagnetic
- C These all are non-radioactive
- D These have coordination number greater than 6
Answer & Solution
Correct Answer
(C) These all are non-radioactive
Step-by-step Solution
Detailed explanation
The promethium Pm
has an atomic number of 61 . The electronic configuration of promethium is as follows:
\(
\mathrm{Pm}=[\mathrm{Xe}] 4 \mathrm{f}^5 6 \mathrm{~s}^2
\)
Promethium (Pm) is the only lanthanide that exhibits radioactivity
has an atomic number of 61 . The electronic configuration of promethium is as follows:
\(
\mathrm{Pm}=[\mathrm{Xe}] 4 \mathrm{f}^5 6 \mathrm{~s}^2
\)
Promethium (Pm) is the only lanthanide that exhibits radioactivity
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