Q19 / 150 · MHT CET 2026 (17 April Shift 2) · Chemistry
What is the atomic number of first post actinoid element ?
- A$101$
- B$108$
- Correct answerC$104$
- D$110$
Solution
The actinoid series consists of elements with atomic numbers from $90$ to $103$.
The elements that follow the actinoid series are known as post-actinoid elements.
Therefore, the first post-actinoid element has an atomic number of $104$, which is Rutherfordium (Rf).
Answer: $104$
The elements that follow the actinoid series are known as post-actinoid elements.
Therefore, the first post-actinoid element has an atomic number of $104$, which is Rutherfordium (Rf).
Answer: $104$
Hence, the correct answer is option: 'C'.