Fluorine belongs to group 17. How many covalent bonds are formed between two fluorine atoms? Your
1
2
3
4

1

Fluorine is in group 7, meaning that it has 7 valence shell electrons and to fulfill the octet rule it can only obtain 1 more electron.

When bonding the last lone pair for each of the two fluorine atoms together you create a total of two electrons shared between each.

Therefore you get a total of 8 valence shell electrons.

Remember: when you have 8 valence shell electrons you have obtained an octet

In other words...

8 valence shell electrons = satisfied octet rule

The reaction will shift to the right

Putting salt in vinegar water