The halogens iodine (III) and astatine (AtAtAt) lie below chlorine in Group 7 of the periodic table.
Explain, in terms of the electronic structure of their neutral atoms, what these elements have in common that accounts for their similar chemical reactivity.
Practise Edexcel GCSE Chemistry Group 7 with exam-style questions for Foundation and Higher tier. 77 questions, matched to the Edexcel GCSE Chemistry (1CH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.
