4.21 - General Trends in Group 7 Flashcards
1
Q
What does the term halogen mean?
A
Salt producer
2
Q
What do all halogens exist as?
A
Diatomic molecules
3
Q
What do their melting and boiling temperatures depend on?
A
The forces of attraction between molecules
4
Q
What are these known as?
A
London forces
5
Q
Are halogen molecules polar or non polar?
A
Non-polar
6
Q
What is the trend in melting and boiling points?
A
They increase down the group
7
Q
Why?
A
Because there are more electrons as you go down the group so forces increase in strength
8
Q
What three factors affect electro negativity?
A
Nuclear charge, distance between nucleus and bonding pair, shielding effect
9
Q
What is the most electronegative halogen?
A
Fluorine
10
Q
What is the trend in reactivity down group 7?
A
It decreases
11
Q
Why?
A
Because electro negativity also decreases
