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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 observe the trend in boiling points of the halogens in Group 7 as we move down the group. The boiling points increase as we descend:
- Chlorine: -35 °C
- Bromine: 59 °C
- Iodine: 184 °C
Astatine is below iodine in the periodic table, so we can expect its boiling point to be higher than 184 °C. A reasonable estimate for the boiling point of astatine would be around 220 °C.
Thus, we write:
boiling point of astatine = approximately 220 °C.
Step 2