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6. what replaces an inner shell vacancy

  • a proton emitted from the nucleus
  • an electron falling from an outer shell
  • an electron from the inner shell

7. gamma emission is not written in a decay equation alone as

  • it always accompanies alpha or beta emission
  • its depressed / likes its own company
  • it is irrelevant

8. In positron emission the mass number remains the same and atomic number decreases by 1

  • true
  • false

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

  • fusion
  • do nothing
  • spontaneously decompose
  • induced fission

10. beta emission is when a neutron changes to a

  • proton and an electron
  • neutron and an electron
  • electron
  • neutron

11. alpha emission decreases

  • Mr by 6
  • Ar by 6
  • mass number by 4 and atomic number 2
  • mass number by 2 and atomic number by 4

12. positron emission is when

  • proton converts into a neutron and positron
  • a positron is captured
  • neutron converts to a proton and a positron
  • positron converts into a proton and neutron

13. If the number of protons change in radioactive decay ....

  • the number of nuetrons also change
  • a new element / daughter element is formed
  • stays as a parent element
  • a son element is formed

14. Alpha particle

  • electron neutrino
  • lithium nucleus
  • helium nucleus
  • positron

15. electron capture is when a nucleus absorbs an inner shell electron

  • true
  • false

16. gamma emission

  • is a state of deficient energy
  • have mass
  • is a state of excess energy
  • is made of particles