Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Ionic number

  1. Oct 1, 2003 #1
    I'm having a terribly difficult time figuring this out and I'm (ashamedly) sure it is quiet simple. How do I know or figure out the ionic charge of a particle. Such as Na or Cl.

    How do I know if they are a minus 1 or positve 2 or what they are?
  2. jcsd
  3. Oct 1, 2003 #2
    Ah, well, this isn't too difficult.

    For non-metallic elements, it's very easy. Noble Gases (the ones farthest to the right), have a charge of 0. Now, as you go to the left, the charge goes down (-1) for every column. Flourine has a charge of -1, Oxygen -2, and so on. When you get to -4, then it's +4/-4. and it starts decreasing as you keep going left. Lithium has a charge of +1 then.

    For metallic elements, it gets difficult. There's really only one way to do it, memorize 'em. ;)
    Last edited: Oct 2, 2003
  4. Oct 2, 2003 #3
    for metallic elements , you have to know how to distribute electrons on atom's shells.
    for exmple Cobalt(27Co] is known as a Metal with two usual ions : +1 , +2 , +3
    that's becuase It's electronic distribution gois like this :
    27Co = 1s2 2s2 2p6 3s2 3p6 4s2 3d7
    as you know , every etom always try to get to the low energy situation , so , it would lose the electrons in the shell with highest energy , which are from the 4th orbit , in 4s2 , and since 3d is almost equal to 4s , so the atom might lose some electrons from it.
    Therefore , B family always make +2 ions , beside other ions depending on the atomic number of the element.

    also , when you learn how to distribute electrons on atom's shells , this ion things will become very easy for you , so I suggest you learn them .
    Excuse my bad enlgish :wink: , I tried my best
    Last edited by a moderator: Oct 2, 2003
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook