group 7 - the halogens Flashcards
1
Q
as you go down the column..
A
- elements become less reactive (harder to gain an extra electron in the outer shell as it is further from the nucleus)
- have higher melting points
- have a higher boiling point
2
Q
what does fluorine react to become?
A
a yellow gas
3
Q
what does chlorine react to become?
A
a poisonous dense green gas
4
Q
what does bromine react to become?
A
a dense poisonous red/brown volatile liquid
5
Q
what does iodine react to become?
A
a dark grey crystalline solid or purple vapour
6
Q
what do they form?
A
1- ions (halides)
