atomic structure
Protons
Positive charge (+1), found in the nucleus.
Neutrons
No charge (neutral), found in the nucleus.
Electrons
Negative charge (-1), move around the nucleus in shells.
What is an atom made of?
protons, neutrons, and electrons.
What part of the atom contains most of the mass?
The nucleus
How can you find the number of protons in an atom?
The number of protons is the same as the atomic number of the atom.
Atomic number
number of protons AND electrons
Mass number
number of protons + neutrons.
Number of neutrons
mass number minus the atomic number