atomic structure c4

• what are outer electrons called?

  Valence electrons
• what protects valence electrons from the pull of the nucleus?

  shielding from the other shells
• occupied electron shells
• what affects atomic radii?

  Effective nuclear charge, number of electron shells, and shielding effect.
• bohr diagram?

  Electron arrangement in an atom. Show all shells.
• nuclear decay worded questions?

  mention penetrating ability (gamma>beta>alpha) and ionisation (alpha>beta>gamma)
• control rods?

  absorb excess neutrons in a fission reaction. Slows the fission chain reaction before it causes a meltdown.
• what makes an atom radioactive?

  Unstable nucleus. Emits particles (in form of abg radiation) to stabilise.