University:
High School
Course:
High School Chemistry
Academic year:

2023
Views:

22

Pages:

1
Author:

Rose G

ATOMS Atoms contain protons, neutrons and electrons. They Also have a radius of about 0. I nanometers (1x10^-10 m). The Nucleus Electrons Neutrons It is in the middle of the atom. It contains protons and neutrons. It has a positive charge because of the protons. • Almost the whole mass of the atom is in the nucleus The Electrons They move around the nucleus in shells • They are negatively charged • They almost have no mass Protons Particle Relative mass Proton Neutron Electron Atomic number number of protons Mass number number of protons number of neutrons Number of neutrons mass number atomic number Number of electrons atomic number Positive ion negatively charged Negative ion positively charged Relative charge Neutrons: 23-11-12 Electrons 11 23 Na 11 mass number Atomic number An ion is an atom or group of atoms that has lost or gained electrons