The particle with 6 protons, 7 neutrons, and electrons is carbon-13. Here's why:

* Protons: The number of protons defines the element. Carbon has 6 protons.

* Neutrons: The number of neutrons determines the isotope. Carbon-13 has 7 neutrons.

* Electrons: In a neutral atom, the number of electrons equals the number of protons. So, carbon-13 also has 6 electrons.