Exams › NEET › Chemistry

Which of the following Lanthanoid is radioactive?

1. Cerium
2. Promethium
3. Thulium
4. Lutetium

Correct answer: Promethium

Solution

Promethium is the only lanthanoid that has no stable isotopes, so it is radioactive. The others listed have at least one stable isotope and are not universally radioactive.

Related NEET Chemistry questions

• Among the following organic acids, the acid present in rancid butter is:
• A ketone has molar mass \( 86 . \) Which of the following cannot be IUPAC name of this ketone?
• An ideal gas is compressed in a closed container its U?
• Which of the following will change the value of the equilibrium constant for the reaction? \( N_{2}(g)+O_{2}(g) \leftrightharpoons 2 N O(g) \)
• Electronic configuration \( [\boldsymbol{K} \boldsymbol{r}] \boldsymbol{4} \boldsymbol{d}^{10} \) belongs to:
• Internal resistance of a battery cell increases with:

⚔️ Practice NEET Chemistry free + battle 1v1 →