In the modern atomic model the number of in a neutral atom is the same as the number of protons.
a. protons
b. neutrons
c. electrons
d. neutrons and electrons

In the modern atomic model the number of electrons in a neutral atom is the same as the number of protons.

An atom contain, three fundamental particles, electron, proton, and neutron, neutron is charge less, there the charge of the atom is determined by the number of proton, and number of electron, Atoms are electrically neutral, it is only possible when number of electrons in an atom is equal to the number of proton.

the force required to move the cart is divided by three or 33.33 n.