Joey's class is learning about atoms. For homework, his teacher has the class draw a model of an atom. The model must show three types of particles—protons, neutrons, and electrons. The protons and neutrons must be shown in the atom's central nucleus, and the electrons must be shown outside the nucleus.

There are no electrons in the atom.

Explanation:

The electron is a subatomic particle, symbol e⁻ or β⁻ , whose electric charge is negative one elementary charge. Electrons belong to the first generation of the lepton particle family, and are generally thought to be elementary particles because they have no known components or substructure.

Unlike protons and neutrons, which are located inside the nucleus at the center of the atom, electrons are found outside the nucleus. Because opposite electric charges attract each other, negative electrons are attracted to the positive nucleus.

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not sure if this what   you'r looking for would be percent composition