Chemistry, 03.12.2019 02:31 negativechill

Which of the following observations indicates that an atom has neutrons?
a. some uncharged particles are scattered by a beryllium atom when it hits a gold foil.
b. some uncharged particles bounce back from a gold foil when it is bombarded with alpha particles.
c. a radiation with neutral particles is emitted when alpha particles strike beryllium atoms.
d. a radiation which attracts electrons is produced when a beryllium atom is bombarded with alpha particles.

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Which of the following observations indicates that an atom has neutrons?
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