GCSE Combined Science (AQA)

622 videos | 38 hours

Ions

Please subscribe to watch this video.

This, and all other videos, are included in our premium subscriptions.

Premium accounts get access to all videos.

Atomic structure Atoms and isotopes

Ions

3:44 Atomic Structure
Spec 4.4.1.2
Previous Mass Number & Isotopes Next Pre-Electron Ideas
  • Atoms have the same number of protons and electrons.
  • Central nucleus contains protons and neutrons; electrons orbit in shells.
  • Atomic number is determined by the number of protons.
  • Protons have a charge of +1; total charge of protons is +4.
  • Electrons have a charge of -1; total charge of electrons is -4.
  • Atom has no overall charge as charges cancel out (+4 and -4).
  • An ion is an atom that has gained or lost electrons.
  • Gaining electrons results in a negative charge (negative ion).
  • Losing electrons results in a positive charge (positive ion).
  • Ions are created by transferring electrons between atoms, forming chemical bonds.
  • Ionization can occur due to ionizing radiation.
  • Atomic notation uses plus or minus signs to denote ion charge.
  • Ions do not change the element, only its charge.
  • Positive ions have a plus sign in the top right; negative ions have a minus sign.
  • Understanding ions is important in both physics and chemistry.

Please subscribe to access these revision notes.

This, and all other video notes, are included in our premium subscriptions.

Premium accounts get access to all videos and revision notes.