Q1

• Balance half equation: 2N3-=N2 + _e-

  6

  each nitride ion has 3- charge, 2 nitride ions are needed, so 6 electrons are removed altogether
• Who suggested electrons orbit the nucleus at specific distance?

  Niels Bohr
• Approximate size of the radius of an atom

  1x10-10m
• As group number increases, do elements become metallic or non-metallic?

  non-metallic
• Fe stands for...

  Iron
• Gas released when group 1 elements react with water:

  hydrogen
• charge of halide ion

  -1
• chemical formula for sodium chloride

  NaCl
• atomic number is the

  bottom number
• mass number is the

  top + bottom number
• name given to substances when atoms of 2 or more elements are chemically combined

  compounds
• Chlorine is a halogen. On a chloride ion, the charge is...

  -1

  halogens have 7e in outer shell so they gain 1 to become -1 ions
• when metals react do they lose or gain electrons

  lose

  they try to achieve a full outer shell of electrons, then become positively charged ions
• when a carbonate reacts with an acid it produces carbon dioxide, a salt and...?

  water
• name given to group 0 elements...

  noble gases
• will lithium and sodium have similar properties?

  yes because they are in the same group,

  elements in the same group have similar properties
• what is the overall charge on an atom

  zerro