Here's how to determine the number of electrons in the 2p sublevel of a chlorine atom in its ground state:

1. Electronic Configuration of Chlorine:

* Chlorine has an atomic number of 17, meaning it has 17 electrons.

* The electronic configuration of chlorine is: 1s² 2s² 2p⁶ 3s² 3p⁵

2. The 2p Sublevel:

* The 2p sublevel is the second energy level and has three orbitals (2px, 2py, and 2pz).

* Each orbital can hold a maximum of two electrons.

3. Number of Electrons in the 2p Sublevel:

* The 2p sublevel in chlorine has a total of 6 electrons (2p⁶).

Therefore, there are 6 electrons in the 2p sublevel of a chlorine atom in its ground state.