What is the intention of atom to form ions?

[yipkawa]

what is the intention of atom to form ions?
how do we know when iron form iron2+ or iron3+ irons?
do we need to remember the electrochemical series?

 

[Hootenanny]

Again, this looks like a series of homework questions. Please attempt the questions yourself first and you will find a greater number of more useful posts in response.

 

[kV the Student]

Well to answer the question of why iron exists as [Fe]2+ and [Fe]3+, we'd need to get into inorganic chemistry, which I cannot answer at this point.

But for main group elements, they exist in isoelectronic series, with Groups 1A and 2A losing as many electrons to attain the previous noble gas configuration, whereas the gaseous elements in Groups 5A to
7A gain as many electrons as the noble gas across from it. Note this is only for the gaseous elements. Bromine is a liquid at room temperature, but is not excluded. (all the halogens gain 1e- to attain the outer configuration of the noble gas directly across from it).

 

[Gokul43201]

There's a semi-formal argument in the following thread (note the correction to the typo - the first 2 instances of the word 'argon' should be replaced with 'neon'):
https://www.physicsforums.com/showthread.php?t=91938&highlight=chemistry

Hoot: I doubt the OP's questions are actually homework - they look like some of those many legitimate chemistry doubts that never get satisfactorily resolved in any series of chem classes.

 

[Hootenanny]

Hoot: I doubt the OP's questions are actually homework - they look like some of those many legitimate chemistry doubts that never get satisfactorily resolved in any series of chem classes.

Point taken.