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Figure 4 shows information about some of the elements in group 7 of the periodic table - Edexcel - GCSE Chemistry Combined Science - Question 4 - 2016 - Paper 1
Question 4
Figure 4 shows information about some of the elements in group 7 of the periodic table. | element | melting point / °C | boiling point / °C | |----------|---------... show full transcript
Worked Solution & Example Answer:Figure 4 shows information about some of the elements in group 7 of the periodic table - Edexcel - GCSE Chemistry Combined Science - Question 4 - 2016 - Paper 1
Step 1
Estimate the boiling point of astatine.
Answer
To estimate the boiling point of astatine, we observe the trend in boiling points of the halogens in group 7. There is an increasing trend in boiling points as we move down the group:
- Chlorine: -35 °C
- Bromine: 59 °C
- Iodine: 184 °C
Considering the placement of astatine below iodine, it is reasonable to estimate that the boiling point of astatine would be higher than that of iodine. A good estimate for the boiling point of astatine could be around 300 °C to 350 °C based on extrapolation of the trends observed in the group.
Thus, we estimate:
boiling point of astatine ≈ 300 °C.
Step 2