1) What are the three main subatomic particles? 2) Where are protons and neutrons located in an atom? 3) What is the charge of a proton? 4) What is the charge of an electron? 5) What is the charge of a neutron? 6) How much smaller are electrons compared to protons and neutrons? 7) What happens when two protons come near each other? 8) What happens when an electron comes near a proton? 9) What does “subatomic” mean? 10) Why can’t atoms be seen with the naked eye? 11) What part of the atom forms a cloud around the nucleus? 12) Why do electrons move at extremely high speeds? 13) What force keeps the nucleus tightly packed? 14) How did scientists discover subatomic particles? 15) Why do atoms have a neutral overall charge? 16) How do scientists represent the property of attraction and repulsion in particles? 17) Why is food irradiation important? 18) How does radioactive dating help archaeologists? 19) Why is tritium mentioned in the text?

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