Download Section 3.3 Inside the Atom SUBATOMIC PARTICLES are the

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Section 3.3 Inside the Atom
SUBATOMIC PARTICLES are the pieces of an atom.
Protons
• positively charged particles located in the nucleus of
atom
• represented by atomic number
• relative mass of 1
• neutral particles (no charge)
• located in the nucleus
Neutrons
• represented by atomic mass – atomic number
• negatively charged particles travel around the
nucleus
Electrons • relative mass of 1/2000
• represented by atomic number
The number of the protons in an atom determines the name of the
element the atom represents.
Ex. 16 protons?
38 protons?
Standard atomic notation is an international system for writing
information about an atom.
atomic mass
35
Cl
symbol
17
atomic number
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