Group 7 Flashcards
Group 2 atomic radii down the group?
Increases
Additional electron shells
Reactivity down group 7?
Decreases
Need to gain an electron
Atomic radius increases down the group due to additional electron shells
Harder to attract an electron
IE down group 7?
Decreases
Greater atomic radius
Increased amounts of shielding
Less energy to remove an electron
Boiling point down group 7?
Increases
Simple covalent molecules held with VDWS
VDW forces increase down group
More energy required to overcome forces
Oxidising power down group 7?
Decreases
Ability to attract electrons decreases
Shielding increases
Atomic radius increases
Cl2 will displace ?
Br- and I- ions due to highest oxidising strength
Br2 will displace ?
I- ions due to oxidising strength
I2 will displace ??
No halide ions due to lowest oxidising strength
Halogens are good ______ agents
oxidising
Halides are good _______ agents
reducing
Halide ion reducing power down the group?
Increases
Electrons easier to lose from larger ions
Due to increased shielding and ionic radii
Sodium fluoride and sulfuric acid reaction
NaF + H2SO4 -> NaHSO4 + HF
Sodium chloride and sulphuric acid reaction
NaCl + H2SO4 -> NaHSO4 + HCl
Sodium bromide and sulphuric acid reaction
NaBr + H2SO4 -> NaHSO4 + HBr
2HBr + H2SO4 -> Br2 + SO2 + 2H2O
Sodium iodide and sulphuric acid reaction
NaI + H2SO4 -> NaHSO4 + HI
2HI + H2SO4 -> I2 + SO2 + 2H2O
6HI + SO2 -> H2S + 3I2 + 2H2O