atoms

• | atoms, protons & neutrons

  has a radius of 0.1 nanometres
• | the nucleus

  • in middle
  • contains protons & neutrons
  • 1x10₋₁₄ m radius
  • POSITIVE CHARGE
  • most mass concentrated of atom in nucleus

  
• | the electrons

  • move around nucleus in electron SHELLS
  • they're negatively charged & tiny but they cover a LOT OF SPACE
  • volume of their orbits determines size of the atom
  • no mass

  
• | the atom

  A) nucleus

  B) electron

  C) neutron

  D) proton

  
• | subatomic properties

  • electron is considered VERY SMALL!!

  A) 1

  B) 1

  C) +1

  D) 0

  E) -1

  
• | number of protons = electrons

  • atoms are NEUTRAL; no charge overall, unlike IONS
  • this bc they have SAME NUMBER of protons as electrons
  • in an ion, number of protons ≠ electrons
  • it has an overall charge
• | ion

  • atom that has lost or gained electrons
  • losing an electron makes the charge positive
  • gaining an electron makes the charge negative
• whats an ion?

  an atom that has lost or gained electrons
• | atomic & mass number

  • atomic number tells you how many PROTONS there are
  • mass number is total PROTONS & NEUTRONS