Chemistry Valencies (1 Viewer)

[Meli_H]

Hi, Does anybody have a list of all the valencies of all the elements on the periodic table?
Thanks

 

[Forbidden.]

Valencies ?

Do you mean Valencies in general or Valence electrons ?

http://en.wikipedia.org/wiki/Valency_%28chemistry%29

Sorry for being lazy, but I hope this helps ... I do chemistry too ...


"Why is Oxygen expressed as O2 ?"

There are

2 eletrons in 1p orbital

2 electrons in 2p orbital

4 electrons in 2d orbital

- 6 electrons in row 2, right ?

and 2 more electrons can fit 2d orbital ?

Oxygen 1 - Takes 2 electrons

Oxygen 2 - Gives 2 electrons

Then theyre both happy

 

[Meli_H]

Thanks and the easy answer to why oxygen is expressed as O2 is because it is a diatomic molecule =)

Now I made my own which includes sthe more common elements and groups and the reactivity dseries of metals, I wrote it because you never know when you might need to study it, especially for writing formulae.

 

[airie]

Oxygen 1 - Takes 2 electrons

Oxygen 2 - Gives 2 electrons

Not exactly like that, but the two oxygen atoms SHARE two electrons between them ie. two electrons from both oxygen atoms - total of four - orbit around the nuclei of both atoms. It is not a polar bond between the two oxygen atoms.

 

[lourai*87]

please correct me if im wrong, but valency i understand to be the ability to lose or gain electrons?

Now, when you look at your periodic table, you have the 8 main groups (columns).

1A - +1
2A - +2
3A - +3
4A - +/- 4 (this one we were told is tricky)
5A - - 3
6A - -2
7A - -1
8A - obviously noble gasses.

Does this make sense? Lets go with oxygen again. We know that Oxygen has 6 electrons in its outer shell. Its aim is to get 8 electrons. So, it receives two to complete its outer shell. Because electrons are negatively charged, the oxygen becomes more negative, hence -2 (2 negative electrons). Please tell me im right here =p

 

[vizman]

Valencies ?

Do you mean Valencies in general or Valence electrons ?

http://en.wikipedia.org/wiki/Valency_%28chemistry%29

Sorry for being lazy, but I hope this helps ... I do chemistry too ...


"Why is Oxygen expressed as O2 ?"

There are

2 eletrons in 1p orbital

2 electrons in 2p orbital

4 electrons in 2d orbital

- 6 electrons in row 2, right ?

and 2 more electrons can fit 2d orbital ?

Oxygen 1 - Takes 2 electrons

Oxygen 2 - Gives 2 electrons

Then theyre both happy

oxygen is a diatomic molecule, that is it exists as O2 like most other gases N2 etc.
oxygen does not give/take electrons with itself, it shares electrons - you can imagine that its two non-metals so its covalent

also you'll have remember the valencies of the transition metals