It turns out that atoms are the small parts that make up all matter on Earth, but, we also know that even atoms aren't the smallest "doll" in our Russian nesting doll analogy. Atoms are made of even smaller parts.
Protons: These are located in the nucleus of the atom and have a positive (+) charge. If you are making a list of Pros and Cons, then the Pros are something you feel positive about. Think about this to help you remember that a proton has a positive charge. They have a mass of 1 atomic mass unit (amu).
Neutrons: These are also located in the nucleus of the atom but have no charge. Neutron is similar to the word neutral, which means you are not aligned with either side. Use this to help remind you that neutrons have no charge. Neutrons have a mass of 1 amu.
Electrons: These are located in a large area outside of the nucleus called the "electron cloud." They move quickly around the nucleus, similar to how the planets spin around the Sun. Electrons have a negative (-) charge, and their attraction to the protons in the nucleus keeps them in the electron cloud, much like Earth's gravity keeps the Moon orbiting around us. Electrons have a mass of 0.000549 amu, which is a much smaller mass than that of the protons or neutrons. There is a large amount of empty space between the nucleus and the electron cloud (well, a large amount of space when you're talking about an atom).