Elements with atomic no. 101,104 belongs to group respectively?

Options

A. Actinoids and group 4
B. group 4 and group 3
C. group 4 and group 5
D. None

Answer

To determine the groups of elements with atomic numbers 101 and 104, we can follow these steps:

### Step 1: Identify the Element with Atomic Number 101
- The element with atomic number 101 is **Mendelevium (Md)**.
- Mendelevium is part of the **actinoid series**, which includes elements from atomic number 89 (Actinium) to 103 (Lawrencium).

### Step 2: Identify the Element with Atomic Number 104
- The element with atomic number 104 is **Rutherfordium (Rf)**.
- Rutherfordium is located in the **7th period** of the periodic table.

### Step 3: Determine the Group of Rutherfordium
- Rutherfordium (Rf) belongs to **Group 4** of the periodic table.
- Group 4 elements are known as the titanium group, which includes titanium (Ti), zirconium (Zr), hafnium (Hf), and rutherfordium (Rf).

### Conclusion
- Therefore, the element with atomic number 101 (Mendelevium) belongs to the **actinoid series**, and the element with atomic number 104 (Rutherfordium) belongs to **Group 4**.

### Final Answer
- The elements with atomic numbers 101 and 104 belong to the groups: **Actinoids and Group 4**, respectively.

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