??? (1 Viewer)

[eternallyboreduser]

What does this q even want me to do? Do they just mean write out the valencies of each element between Sodium and argon?

 

[eternallyboreduser]

View attachment 42741

LMFAOOO

 

[eternallyboreduser]

LMFAOOO

Nah fr tho wtf does that even mean

 

[wizzkids]

It seems like a perfectly good question. There are eight elements in the third period. They each have very different electronegativities, some are electron donors (Na, Mg, Al) and some are electron acceptors (P, S, Cl). Si is an interesting case to discuss. Then there is Ar which doesn't form compounds and you could call it valency 0.

 

[eternallyboreduser]

It seems like a perfectly good question. There are eight elements in the third period. They each have very different electronegativities, some are electron donors (Na, Mg, Al) and some are electron acceptors (P, S, Cl). Si is an interesting case to discuss. Then there is Ar which doesn't form compounds and you could call it valency 0.
View attachment 42747

Yeah ik but what does the q want me to do? Just list out the valencies or what?

 

[banigul@30]

Yeah ik but what does the q want me to do? Just list out the valencies or what?

question makes no sense lol why is it 4 marks

 

[eternallyboreduser]

question makes no sense lol why is it 4 marks

Yeah exactly wth do they even want me to compare theres nothing to compare for valencies

 

[Luukas.2]

question makes no sense lol why is it 4 marks

Yeah exactly wth do they even want me to compare theres nothing to compare for valencies

I think the observation implicit in these questions / comments is important... why is this worth 4 marks? Is it just a mistake, or an indication that something is being missed?

Start by considering the term "valency"... it is more than just the charges in @wizzkids' table, which tells us about ionic forms. I can use them to predict magnesium phosphide will be Mg₃P₂, for example, but what about the compounds of non-metals?

Then, notice that the period requested is not period 2, which is more chemically straight-forward, but period 3... how does this make a difference?

Period 3 non-metals have the ability to expand valence shells and violate the octet rule as the 3d sub-shell is accessible.

Now, think about the valency implications of phosphorous forming both PCl₃ and PCl₅.

What about sulfur forming H₂S, SCl₂, SOCl₂, SO₂, SO₃, SF₂, SF₄, and SF₆?

Or, chlorine forming Cl₂O, Cl₂O₃, Cl₂O₅, and Cl₂O₇?

I can say that nitrogen has a valency of 3, but is that always true of phosphorous? Are there comparisons that I can make between period 3 and their counterpart period 2 elements, or comparisons with each other within period 3?

I think there is scope to say a lot in answer to this question, both about ionic and covalent compounds...