2º ESO/MATERIAL WORLD/ATOMO Complete the sentences: An atom contains a tiny nucleus, which contains particles called {1:MULTICHOICE:~electrons~=protons~=neutrons} and {1:MULTICHOICE:~electrons~=protons~=neutrons}. The {1:MULTICHOICE:~=electrons~protons~neutrons} travel around the outside of the atom. They are arranged in {1:MULTICHOICE:~=shells~molecules~ions}.

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