A (M-A)
N
M
A
E
P
Atomic Mass
Number of Protons
The dense and compact core of the atom that contains all of the protons and neutrons. (Nucleus)
Number of Neutrons
Subatomic particle with a neutral (0) charge and a mass of 1 atomic mass unit (1 amu) (Neutron)
Electrons located in the outermost electron shell. This is the shell responsible for chemical reactivity. (Valence Electron)
Circular areas that make up the electron cloud. These shells are the path that electrons take as they constantly move around the nucleus. (Energy Shells/Electron Shells)
Area located outside of the dense compact core. This area is mostly empty space and is where all the electrons are located. (Electron Cloud)
Atomic Number (M-A)
Atomic Number
Number of Electrons
Subatomic particle with a positive (+1) charge and a mass of 1 atomic mass unit (1 amu) (Proton)
Subatomic particle that has a negative (-1) charge and has zero atomic mass units (0 amu) (Electron)
