Atoms, Molecules, And Ions Worksheet - Chapter 2 Page 4
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27Radioactivity:
The spontaneous emission of radiation by an atom.
Also studied by Marie (1867-1934) and
First observed by
Pierre Curie (1857-1906). Discovered Po
Henri Becquerel.
and Ra. Suggested that atoms of certain
(1852-1908)
substances can disintegrate.
Radioactivity
Three types of radiation were
discovered by Ernest Rutherford:
particles
positively charged
(+2),
large mass
particles
negatively charged
(-1),
small mass
rays
no
charge,
no mass
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