The element astatine, At, is below iodine in Group 7 - OCR Gateway - GCSE Chemistry: Combined Science - Question 3 - 2018 - Paper 1
Question 3
The element astatine, At, is below iodine in Group 7.
Which prediction about astatine is correct?
A Astatine is a gas.
B Astatine is more reactive than iodine.
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Worked Solution & Example Answer:The element astatine, At, is below iodine in Group 7 - OCR Gateway - GCSE Chemistry: Combined Science - Question 3 - 2018 - Paper 1
Step 1
A Astatine is a gas.
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Answer
This statement is incorrect because astatine is a solid at room temperature, as it is a heavy halogen.
Step 2
B Astatine is more reactive than iodine.
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Answer
This statement is not correct; while astatine is below iodine in Group 7, its reactivity is less than that of iodine due to its higher atomic mass and stability characteristics.
Step 3
C Astatine is white.
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This statement is also incorrect because astatine is typically thought to be a black solid or dark in color, but its exact appearance is not well-documented due to its rarity and radioactivity.
Step 4
D Astatine reacts with sodium to form NaAt.
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Answer
This statement is correct. Astatine, being a halogen, can react with sodium to form the compound sodium astatide (NaAt).
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