Amajor part of the modern atomic model is that the location and of an electron are not known exactly. a. mass b. charge c. number d. movement

B) Charge

Explanation:

The modern atomic model is called the quantum mechanical model and was purposed based on quantum physics. One of the principles that explain that model is the Heisenberg uncertainty principle.

This principle states that it's impossible, in a certain time, to determinate both the energy and position of an electron. The position is the same as location, and energy could be also called the charge of the electron.

neutrons are in the middle of the atom and the electrons, which are much smaller.