What does it mean of an entire atom has a neutral charge ? Describe the movement of the electrons.

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Because it has equal number of electrons and protons

Explanation:

There are three types of particles in an atom:

- Proton: the protons are in the nucleus. They have positive charge equal to , and mass of .

- Neutron: the neutrons are in the nucleus as well. They have no electric charge and their mass is similar to that of the protons, just slightly smaller.

- Electron: the electrons orbit around the nucleus. They have negative charge opposite to that of the protons,  , and they also have much smaller mass (1800 times lighter than the proton). The electrons reside outside the nucleus, in a region of space called "electron cloud". In Bohr's model of the atom, their motion is described as a circular motion, in fixed orbits around the nucleus, where each orbit is associated to a specific energy level.

Atoms have a neutral charge because they have same number of protons and electrons: therefore, since their charge is the same, the charges from the protons and the electrons cancel out, and the net total charge is zero.