Part A. Which subatomic particle(s) are found in the nucleus of the atom?
Enter the subatomic particle or particles separated by commas.
Atoms are composed of electrons, neutrons, and protons. Their properties are shown in the table to the right.
Electrons are the lightest of these three subatomic particles. Electrons have a mass of 9.109 × 10−28 g, which is about 0.05% that of the masses of protons and neutrons, and are assigned a −1 charge. Electrons are distributed outside the nucleus of an atom. Note that, despite the popular model, electrons do not orbit at fixed distances from the center of an atom. Rather, they reside within an electron cloud as shown in the figure. Except for nuclear chemistry, all chemistry involves the distribution of electrons among different atoms of compounds.
Protons have a mass of 1.673 × 10−24 g. Protons are assigned a +1 charge.
The third subatomic particle is the neutron. Neutrons have approximately the same mass as protons, but they do not have a charge. Along with protons, neutrons comprise the nucleus at the center of an atom.
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