Introduction to Sub-atomic Particles

Details of the 3 sub-atomic particles

• Proton
• position = nucleus
• relative mass = 1
• relative charge = +1
• Neutron
• position = nucleus
• relative mass = 1
• relative charge = 0
• Electron
• position = orbitals
• relative mass = 1/1840
• relative charge = -1
• 
• Caption: There are various models for atomic structure.

Chemical Formula

• An atom of Lithium can be represented as right -->
• The atomic number, Z, is the total number of protons in the nucleus.
• The mass number, A, is the total number of protons and neutrons in the atom.
• Number of neutrons = A - Z
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