Structure of the Nucleus

• nuclei are composed of “nucleons”: protons and neutrons

electron

proton

neutron

Symbol

e-

p+

n

Charge

-1

+1

0

Mass, amu

0.000548

1.007276

1.008665

Mass, kg

9.10953 x 10-31

1.67265 x 10-27

1.67495 x 10-27

hydrogen helium lithium beryllium

nucleus nucleus nucleus nucleus

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Nuclei with more than 83 protons are unstable.

promethium and technetium have no stable isotopes.