In the name carbon dioxide, the prefix of the second word indicates that a molecule of carbon dioxide contains
two carbon atoms.
two oxygen atoms.
a polyatomic ion.
an ionic bond.

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