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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 can look at the trend in boiling points of the elements listed in Group 7. The boiling points increase as we move down the group. The boiling points of iodine (184 °C) suggest that astatine will have a boiling point higher than this due to its position below iodine.
Given the provided boiling points:
- Fluorine: -188 °C
- Chlorine: -35 °C
- Bromine: 59 °C
- Iodine: 184 °C
Astatine is expected to be around 210 °C as the boiling point, following the increasing trend.
Step 2