Here's why:
* Number of protons defines the element: The number of protons in an atom's nucleus determines what element it is. This is known as the atomic number.
* Electrons balance protons: In a neutral atom, the number of electrons orbiting the nucleus always equals the number of protons. This creates a balance of positive and negative charges.
* Isotopes and electrons: Since isotopes of an element have the same number of protons, they also have the same number of electrons in their neutral state.
Example:
* Carbon-12 and Carbon-14 are both isotopes of carbon.
* They both have 6 protons, making them carbon atoms.
* They have 6 and 8 neutrons, respectively, giving them different atomic masses.
* They both have 6 electrons when neutral.
In summary: Isotopes have the same number of electrons as their corresponding element in their neutral state because the number of electrons is determined by the number of protons, which remains constant in isotopes. The difference in neutron count only affects the atomic mass.
