group 7 Flashcards
1
Q
What type of molecules are group 7?
A
they are diatomic molecules 
2
Q
what is chlorine?
A
A poisonous green gas
3
Q
what is bromine?
A
A poisonous red/brown liquid
4
Q
What is iodine?
A
A dark, grey solid, but when heated, it’s a poisonous purple vapour
5
Q
what happens as you move down the group?
A
Melting and boiling point increases while reactivity decreases
6
Q
Why does reactivity decrease as you go down the group?
A
Outer shell gets further away from positive nucleus
Electric static force that is needed to attract electron gets weaker
7
Q
What is it called with a halogen gains an electron to form a minus one ion
A
Halide
