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Structure of the atom
Protons
• Have Positive (+) charge
• Found in Nucleus of atom
• Same mass as neutron
Neutrons
• Have no charge (Zero)
• Found in Nucleus of atom
• Same mass as proton
Electrons
• Have a negative charge (-)
• Found outside nucleus
• Have very small mass (almost can
ignore)
Subatomic Particles
Atom
Protons
Neutrons
Electrons
Particle
Symbol
Charge
Mass
Electron
e-
-1
1/1836
Proton
p+
+1
1
Neutron
n
0
1
Atomic Number
• Atomic number = number of
protons
– For neutral atom = number of
electrons
• Atoms of different elements have
different Atomic numbers
(number of protons)
– At # Hydrogen = 1
– At. # Carbon = 6
Mass number
• Mass number = protons + Neutrons
(p+n)
– Electron mass too small (ignored)
• # Neutrons = Mass # – Atomic #
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