atomic structure

• isotope


  an atom of an element that has the same number of protons but a different number of neutrons
• charge of proton


  +1
• charge of neutron


  0
• charge of electron

  -1
• relative mass of proton

  1
• relative mass of neutron

  1
• relative mass of electron


  1/2000
• observation when burning magnesium in oxygen

  bright white light, white powder left behind
• observations when carbon burnt in oxygen

  glows orange
• observations when sulfur is burnt in oxygen


  melted into liquid plus purple flame
• what do non-metal elements create when they react with oxygen

  acidic oxides
• what do metal elements create when they react with oxygen


  alkaline oxides
• why are noble gases unreactive?

  they do not easily lose or gain electrons as they have a full outer shell