Question

Which statements are correct
The element astatine, At, is below iodine in Group VII of the Periodic Table.
Which statements concerning At will be correct?
1 It is a dark-coloured solid at room temperature.
2 It is a more powerful oxidising agent than iodine.
3 Its hydride is thermally stable.

Answer 1

2 and 3 do not make sense
reduction power increases down the group 7 thus oxidizing power decreases down the group 7, so 2 is wrong
thermal stability of hydrides of group 7 decreases down the group, so 3 is also wrong

Answer 2

only 1 makes sense because as we go down the group 7 the colour of halogens become darker and darker

Answer 3

thank you for your help :D

Answer 4

you r welcome :)