The Structure of the Atom
≈ 25 minEvery atom is built from three subatomic particles:
| Particle | Charge | Relative mass | Location |
|---|---|---|---|
| Proton | 1 | nucleus | |
| Neutron | 1 | nucleus | |
| Electron | ≈ 0 (about 1/1836) | orbits the nucleus |
The nucleus is a tiny, dense core of protons and neutrons holding almost all the mass. Electrons move in the space around it in energy levels (shells). A neutral atom has equal numbers of protons and electrons, so the and charges cancel.
Which particle carries a negative charge?
A neutral atom has 11 protons. How many electrons does it have?
In which part of the atom are the protons and neutrons found? (one word)