ionic charges

  • 0 votes

I do not get how you can relate the charges from the periodic table with the group number with simple ions.. please explain:-) thank you 

Posted Sun 3rd June, 2012 @ 17:53 by
Edited by on Sun 3rd June, 2012 @ 17:56

11 Answers

  • 2 votes

Hi Megan

If you look at sodium which is in group 1 it has 1 positive ion

If you look at calcium which is in group 2 it has 2 positive ions


If you look at chlorine which is in group 7 it has 1 negative ion

If you look at oxygen which is in group 6 it has 2 negative ions


However if you look at helium which is in group 8/0 it has no ions this is because it has a full outer shell

I hope you understand comment underneath if you have any other questions :)

Answered Sun 3rd June, 2012 @ 17:59 by Georgia
  • 2 votes

Ok I'm going to create a document so you can understand this a bit better. Helium has a full outer shell of eight electrons it's a fact it can't be explained it's just something you need to learn. I will post the link to the document in a minute :)

Answered Sun 3rd June, 2012 @ 18:07 by Georgia
  • 2 votes

Megan, one way to remember this is the groups on the top tell u how many outer electrons there are, so group 1 metals are the most reactive because they want to become stable and to do that they need to have a full outer shell.

now if we take sodium which is in group 1 u know that it has 1 outer electron. U also know that the elements in the periodic table are neutral. This means that they must have equal number of protons and electrons

What does this mean????

Well if sodium is losing 1 electron then it measn that there is more protons than electrons because 1 electron left. Therefore it has 1+ charge! 

This is just the breakdown of why they have such a charge, but all u have to do is look at the group of the element and that group number will tell u that it is a positive charge n the number will tell u how many electrons left e.g if 1 electron leaves then you get 1+ , if 2 electrons leave then it will have a charge of 2+ .

Now does that mean chlorine which is in group 7 has a charge of 7+ ????????????

No! If u read before i said that elements want to gets a full outer shell. Now if chlorine has 7 outer electrons then u ask urself this question, is it easier to lose 7 electrons or GAIN 1 ELECTRON!!!! 

Obviously it is easier to get 1 electron!!!!!! AAAAHHH! this means that there are more electrons then protons therefore if we say chlorine gains 1 electron, it means it has a charge of -1!!!

Another example is oxygen which is in group 6. u ask urself again whether it is easier to lose 6 electrons or gain two electron etc... then u know it has a -2 charge!!!!

What about sulphur which is in group 4?????

That is a good question because it could either lose of gain 4 electrons. The answer to this is the following. (P.S im not sure if u need to know this but ill tell u anyway as it is good info for further chemistry if u take it =D)

Group 4 elements dont from ions! What i mean to say is under natural conditions they will not form a ionic compound (ionic compound: is when two opposite charged ions bond together), instead they bond covalently which is that they dont have a charge but instead they share their electrons with the other element or atom!!!!


Groups: tell u how many electrons are in the outer shell

Periods: I didnt mention it but it means how many electron shells a element has (how many rings it has e.g. if u look at this link, and u count how many rings it has ===> there are 2!:

Non-metals (Groups 5,6,7) form negative ions!!!!!!!!!!!

Metals (Groups 1,2,3) form positive ions !!!!!!!!!

Anyway hope i helped =D **

Answered Sun 3rd June, 2012 @ 19:59 by Braniac
Edited by Braniac on Sun 3rd June, 2012 @ 20:00
  • 1 vote

Hope this helps :)

Answered Sun 3rd June, 2012 @ 18:20 by Georgia
  • 0 votes

what group does it start to go into the negatives? and how do you know how many charges when it is negative? thank you:-)

And why does helium have a full outer shell?

Answered Sun 3rd June, 2012 @ 18:03 by
  • 0 votes

thank you!! that's really kind:-D

Answered Sun 3rd June, 2012 @ 18:10 by
  • 0 votes

thank you very much, i now understnad:-)

Answered Sun 3rd June, 2012 @ 18:25 by
  • 0 votes

Great! You're very welcome :)

Answered Sun 3rd June, 2012 @ 18:26 by Georgia
  • 0 votes

So basically what I said but in less words

Answered Mon 4th June, 2012 @ 08:28 by Georgia
  • 0 votes

kinda but i did in more detail... but yh pretty much the same thing =D

Answered Mon 4th June, 2012 @ 15:32 by Braniac
  • 0 votes

thank you to both of you..both very helpful and yer will be doing futher:-)

Answered Tue 5th June, 2012 @ 14:54 by