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 the 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)**. This element is part of the actinide series, which includes elements with atomic numbers from 89 to 103.

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

### Step 3: Determine the Group of Mendelevium (Atomic Number 101)
- Since Mendelevium (101) is part of the actinide series, it does not belong to a specific group in the traditional sense like the main group elements. However, it is often classified under the **f-block** elements.

### Step 4: Determine the Group of Rutherfordium (Atomic Number 104)
- Rutherfordium (104) is located in **Group 4** of the periodic table. This can be confirmed by looking at the periodic table where Rutherfordium is positioned.

### Conclusion
- Therefore, the groups for the elements with atomic numbers 101 and 104 are:
- Atomic number 101 (Mendelevium) belongs to the actinide series.
- Atomic number 104 (Rutherfordium) belongs to **Group 4**.

### Final Answer
- The groups of the elements with atomic numbers 101 and 104 are: **Actinide series** and **Group 4**, respectively.

---