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2. radiations must come from

  • the nucleus of the atom
  • the electrons of the atom
  • the energy levels/ shells
  • protons only

3. Alpha particle

  • positron
  • electron neutrino
  • helium nucleus
  • lithium nucleus

4. what does an unstable nucleus do in an attempt to reach a more stable arrangement?

  • fusion
  • do nothing
  • spontaneously decompose
  • induced fission

5. in electron capture the mass number is unchanged and atomic number decreases by one

  • true
  • false
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