Group 7: Reactivity & Electronic Configurations Flashcards

All 6 cards in this deck

What happens to reactivity going down Group 7?

It decreases — fluorine is the most reactive halogen.

How many electrons are in the outer shell of a Group 7 atom?

Seven.

In terms of electron shells, what makes it harder for a halogen atom lower down Group 7 to gain an electron?

Its outer shell is further from the nucleus and shielded by more inner shells, so the attraction for an extra electron is weaker.

What ion does a halogen atom form when it reacts?

A halide ion with a $1-$ charge, giving a full outer shell.
e.g. $\mathrm{Cl^-}$

True or false? Chlorine is more reactive than bromine because chlorine atoms lose electrons more easily.

False. Halogens gain electrons; a chlorine atom gains an electron more easily than a bromine atom.

Using the Group 7 trend, how reactive is astatine compared with the other halogens?

The least reactive — so iodine would displace astatine from a solution of an astatide.