a What trend in volatility is seen going down Group 17?

b. Using Table 12.1, what is the state of each halogen at 20°C?

c. What is the trend in the atomic radii of the halogens? Explain this trend.

d. Astatine (At) lies below iodine at the bottom of Group 17. Predict its:

i. State at 20°C

ii. Colour

iii. Atomic radius.

Transcribed Image Text:

Group 17 Atomic Melting Boiling element radius / point / °C point / °C Colour nm fluorine (F,) 0.072 pale yellow green/yellow -220 -188 chlorine 0.099 -101 -35 (CI,) orange/ brown bromine 0.114 -7 59 (Br,) grey/black solid, purple vapour iodine (I,) 0.133 114 184 Table 12.1 Some physical properties of the Group 17 elements. The atomic radius value is taken from single covalent data (see page 51).