All large radioactive atoms decay into smaller atoms by
releasing alpha particles. Each alpha particle has 2
An alpha particle is also referred to as a nucleus of
protons, 2 neutrons,
and 0 electrons. The
table below
which isotope?
§
describes several neutral, low-mass atoms.
• lithium-7
Stable Isotopes of Low-Mass Elements
• helium-4
Element Name Symbol Atomic
Number of
•
hydrogen-2
Number
Neutrons
Hydroqen
H
O helium-2
Helium
He
0
Lithium
Li
2
Beryllium
3
2
Be
4
4
5
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