The elements Europium and Rutherfordium belong respectively to :

Options

A. Group 3 and Group 6
B. Group 4 and Actinoidsd
C. Lanthanoids and Group 4
D. Group 4 and Group 10

Answer

To determine the groups and periods of the elements Europium and Rutherfordium, we can follow these steps:

### Step 1: Identify the Position of Europium
- Europium (Eu) is an element with atomic number 63.
- It is part of the lanthanide series, which consists of elements 57 to 71 in the periodic table.

### Step 2: Identify the Group of Europium
- Europium belongs to the f-block of the periodic table.
- As a lanthanide, it is typically classified under the rare earth metals.
- The lanthanides are not assigned a specific group number in the same way as the main group elements, but they are often associated with the f-block elements.

### Step 3: Identify the Position of Rutherfordium
- Rutherfordium (Rf) is an element with atomic number 104.
- It is part of the actinide series and is located in the d-block of the periodic table.

### Step 4: Identify the Group of Rutherfordium
- Rutherfordium is classified as a transition metal and belongs to group 4 of the periodic table.
- It is positioned in the 7th period.

### Step 5: Conclusion
- Therefore, Europium belongs to the lanthanides (f-block) and Rutherfordium belongs to group 4 (d-block).

### Final Answer
Europium belongs to the lanthanides (f-block), and Rutherfordium belongs to group 4 (d-block).

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