group 7 Flashcards
1
Q
group 7
A
halogens
2
Q
melting point down group 7
A
increases
larger molecules
van der waal forces
3
Q
electronegativity
A
power of atom to attract the pair of electrons in a covalent bond
4
Q
disproportionate reaction
A
element is oxidising and reducing
5
Q
properties of F2
A
pale yellow gas, highly reactive
6
Q
properties of Cl2
A
greenish, reactive gas
7
Q
Br2
A
red liquid gives off brown fumes
8
Q
I2
A
grey solid sublimes to purple gas
9
Q
oxidising strength down the group
A
decreases
10
Q
reaction of halide ions with with silver nitrate solution
A
F2- no precipitate
Chlorides- white precipitate
Bromides- cream precipitate
Iodides- pale yellow precipitate
11
Q
A
