atomic structure yr 11

• what number is always the atomic


  smallest
• electrons are lost

  atoms become positive
• when electrons are gained

  atoms become negative
• what are isotopes

  atoms of an element with the same atomic number but a different mass number
• what is a compound

  2 or more elements chemically combined
• cations

  positive ions
• anions


  negative ions
• how ions are formed

  an element will either lose or gain electrons to try form a full outer shell
• mass number


  the total number of protons and nuetrons in an atom
• atomic number


  number of protons in an atom