An element 'X' on emitting an α-particle does not change its group number in the periodic…
Chemistry · NEET · NTA Exams — Structure of Atom
An element 'X' on emitting an α-particle does not change its group number in the periodic table. The element is:
- Radium
- Lanthanum
- Lawrencium
- Cerium
Answer
(B) Lanthanum
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