[garyadamson]

Going down group 7 the amount of energy levels increases, this thus means that there is more electrons, however they are obviously further away from the nucleus. Does this mean that the more electrons a Hallogen has the higher the reactivity or the lower the amount of electrons a halogen has the higher reactivity.

I'm slightly confused because i'm not sure how many electrons fill the energy levels of halogens.

Sorry for my poor explanation. I'm new too all of this

thanks in advance
gary

[Yggdrasil]

What do halogens try to accomplish during a chemical reaction?  Do they seek to gain electrons or lose electrons?  If they seek to gain electrons, does adding an electron to an orbital closer to the nucleus or farther from the nucleus give a larger gain in energy?  If they seek to lose electrons, is it easier to lose an electron in an orbital closer to the nucleus or farther from the nucleus?

[shaziaahsan]

What do halogens try to accomplish during a chemical reaction?  Do they seek to gain electrons or lose electrons?  If they seek to gain electrons, does adding an electron to an orbital closer to the nucleus or farther from the nucleus give a larger gain in energy?  If they seek to lose electrons, is it easier to lose an electron in an orbital closer to the nucleus or farther from the nucleus?

they normally try to lose electron.it is easier for them to lose electron from those orbits which are farther away from nucleus.more away the shell from the nucleus make easier to lose electron because the attaraction between positive charge in nucleus and negative charge on electron weakens as the shells moves aways from k nucleus.

[Yggdrasil]

Halogens normally tend to gain electrons.  For example, chlorine has 7 valence electrons and would like to have a noble gas configuration.   It can achieve this by either losing 7 electrons or gaining one.  Obviously it will be easier for chlorine achieve a noble gas configuration by gaining a single electron to become Cl^-.