Elements with `Z =107, 108` and `109` have been made recently. Indicate the groups to which they belong.

Explanation

To determine the groups of the elements with atomic numbers 107, 108, and 109, we will follow these steps:

### Step 1: Identify the elements
- The elements with atomic numbers 107, 108, and 109 are:
- Element 107: Bohrium (Bh)
- Element 108: Hassium (Hs)
- Element 109: Meitnerium (Mt)

### Step 2: Write the electron configurations
- We need to write the electron configurations for each of these elements to identify their groups.
- For Z = 107 (Bohrium):
- The electron configuration is:
\[ \text{Rn} \, 7s^2 \, 5f^{14} \, 6d^5 \]
- For Z = 108 (Hassium):
- The electron configuration is:
\[ \text{Rn} \, 7s^2 \, 5f^{14} \, 6d^6 \]
- For Z = 109 (Meitnerium):
- The electron configuration is:
\[ \text{Rn} \, 7s^2 \, 5f^{14} \, 6d^7 \]

### Step 3: Determine the groups
- The group of an element in the D block can be determined by adding the number of electrons in the outermost s and d orbitals.
- For Z = 107 (Bohrium):
- The last electron configuration is \( 6d^5 \).
- Group = \( 2 \, (from \, 7s^2) + 5 \, (from \, 6d^5) = 7 \)
- For Z = 108 (Hassium):
- The last electron configuration is \( 6d^6 \).
- Group = \( 2 \, (from \, 7s^2) + 6 \, (from \, 6d^6) = 8 \)
- For Z = 109 (Meitnerium):
- The last electron configuration is \( 6d^7 \).
- Group = \( 2 \, (from \, 7s^2) + 7 \, (from \, 6d^7) = 9 \)

### Final Answer:
- Element 107 (Bohrium) belongs to **Group 7**.
- Element 108 (Hassium) belongs to **Group 8**.
- Element 109 (Meitnerium) belongs to **Group 9**.