Protons, Electrons and Neutrons What is an Atom? Protons, Electrons and Neutrons

ATOM Smallest particle of any kind of matter An atom is a million times smaller than the thickest human hair. The diameter of an atom ranges from about 0.1 to 0.5 nanometers (1 × 10-10 m to 5 × 10-10 m).

Subatomic Particles Inside the atom, there are particles that are even smaller, that make up the atom. Pieces of the atom, or what the atom is made of.

Average Mass Units Particles in the atom are measured in mass by using Average Mass Units (or amu). 1 kg rice – 1 gram rice – 876 micrograms is the mass of 1 grain of rice A single amu is 1.6726*10-27 kg

Small, Smaller, Smallest… Example: 876 micrograms is equal to 527539170686700000000 amu 4) 1 microgram is equal to 602213665167500000000 amu OR 1 amu is equal to 1.6605402 *10-21 micrograms

PROTONS Positively charged particles with a mass of 1 amu Symbol = p+ Located in the nucleus

NEUTRONS Neutral (no charge) particles with a mass of 1 amu Symbol = n Found also in the nucleus

ELECTRONS Negatively charged particles 2000 times smaller than 1 amu (protons and neutrons) Travel in space around the nucleus (electron shell)

Comparing the parts of the atom How can you use the idea of the track outside like an atom?