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ElectronsElectrons (-) charge no mass located outside the nucleus
ProtonsProtons (+) charge 1 amu located inside the nucleus
NeutronsNeutrons no charge 1 amu located inside the nucleus
Particles in the Atom
Discovery of the Neutron
James Chadwick bombarded beryllium-9 with alpha particles, carbon-12 atoms were formed, and neutrons were emitted.
n10
+He42
+Be94 C12
6
Dorin, Demmin, Gabel, Chemistry The Study of Matter 3rd Edition, page 764 *Walter Boethe
Subatomic particles
Electron
Proton
Neutron
Name Symbol ChargeRelative mass
Actual mass (g)
e-
p+
no
-1
+1
0
1/1840
1
1
9.11 x 10-28
1.67 x 10-24
1.67 x 10-24
Subatomic Particles
POSIT IVECHARG E
PROT ONS
NEUT RALCHARG E
NEUT RONS
NUCLEUS
NEG AT IVE CHARG E
ELECT RONS
AT OM
Most of the atom’s mass.
NUCLEUSNUCLEUS ELECTRONSELECTRONS
PROTONSPROTONS NEUTRONSNEUTRONS Negative Charge
PositiveCharge
NeutralCharge
ATOM
QUARKSAtomic Numberequals the # of...
equal in a neutral atom
Courtesy Christy Johannesson www.nisd.net/communicationsarts/pages/chem