The atomic number of an element is 86 . The number of electrons present in the outer most orbit and the number of orbits are

Options

A. `8-6`
B. `8-7`
C. `4-6`
D. `7-7`

Explanation

To solve the problem, we need to determine the electronic configuration of the element with atomic number 86 and identify the number of electrons in the outermost orbit (valence electrons) and the total number of orbits (shells).

### Step-by-Step Solution:

1. **Identify the Element**:
The atomic number 86 corresponds to the element Radon (Rn).

2. **Determine the Electronic Configuration**:
We will fill the electrons according to the Aufbau principle, which states that electrons occupy the lowest energy orbitals first. The order of filling is as follows:
- 1st shell (K): 2 electrons
- 2nd shell (L): 8 electrons
- 3rd shell (M): 18 electrons
- 4th shell (N): 32 electrons
- 5th shell (O): 18 electrons
- 6th shell (P): 8 electrons

Adding these up for Radon:
- K: 2
- L: 8
- M: 18
- N: 32
- O: 18
- P: 8

The electronic configuration for Radon (Rn) can be written as:
\[ 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^{10} 4p^6 5s^2 4d^{10} 5p^6 \]
This can be simplified to:
\[ [Xe] 4f^{14} 5d^{10} 6s^2 6p^6 \]

3. **Count the Electrons in the Outermost Orbit**:
The outermost orbit for Radon is the 6th shell (P), which contains 8 electrons (6s^2 6p^6).

4. **Count the Total Number of Orbits (Shells)**:
The total number of orbits (shells) filled is 6 (K, L, M, N, O, P).

5. **Final Answer**:
The number of electrons present in the outermost orbit is 8, and the total number of orbits is 6.

### Conclusion:
The answer to the question is:
- Number of electrons in the outermost orbit: **8**
- Number of orbits: **6**