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Help with Electron Configuration please :) (1 Viewer)

~shinigami~

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Can someone explain to me how to use that diagram above to work out the electron configuration of Xenon(54).

I understand that the 3rd shell can hold up to 18 electrons but first the 4th shell needs to fill up 2 before more can be added to the 3rd shell.

The electron configuration for Xenon is 2,8,18,18,8.

But because I'm so confused I wrote down 2,8,18,18,6,2 (don't ask, I have no idea what happened there)

Sorry if this is a really stupid question or my question is not coherent. I'm just finding it hard to grasp this concept since in junior year only the first 20 elements where ever used.

Thanks in advance for helping me.
 

insert-username

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To use these diagrams, all you do is follow the arrows, counting as you go, and then once you get to the right number, you add across each line for the electron configuration. Each "level" is a shell - first shell has two, second has 8, third has 18 (8+10, count across the page), etc. If you follow the arrows until you get to 54, you'll get to the line with (2+6) as your final one.

A side note: This is not required for the HSC, so don't stress too much if you still don't quite get it. It won't be examined on, and nothing in the HSC course relies on knowing this off by heart. :)

These things are a little complicated to explain, and I hope I haven't confused you more,


I_F
 

vizman

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you can also use the quantam mechanical model of the atom

s p d f sub- shells

s- 2
p- 6
d - 10
f- 14
 

~shinigami~

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insert-username said:
To use these diagrams, all you do is follow the arrows, counting as you go, and then once you get to the right number, you add across each line for the electron configuration. Each "level" is a shell - first shell has two, second has 8, third has 18 (8+10, count across the page), etc. If you follow the arrows until you get to 54, you'll get to the line with (2+6) as your final one.

A side note: This is not required for the HSC, so don't stress too much if you still don't quite get it. It won't be examined on, and nothing in the HSC course relies on knowing this off by heart. :)

These things are a little complicated to explain, and I hope I haven't confused you more,


I_F
Thank You so very much, I finally understand it. :) Wow, it's so simple, I can't believe I didn't understand before.

Thanks again. :D

vizman said:
you can also use the quantam mechanical model of the atom

s p d f sub- shells

s- 2
p- 6
d - 10
f- 14
What's this quantam mechanical model? I'm confused
 

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~shinigami~ said:
What's this quantam mechanical model? I'm confused
Once again, this is not in the HSC course, so you don't need to worry about it [yet]. ;)
 

~shinigami~

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Just a quick question, why are they teaching electron configuration in the Prelim if it's not even in the HSC?

What is in the HSC? Stuff that's even harder?
 

Riviet

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~shinigami~ said:
Just a quick question, why are they teaching electron configuration in the Prelim if it's not even in the HSC?
Not everything in the prelim course is examined for the HSC, but many of the prelim topics are like the basics of the HSC course such as redox reactions, which are covered in some more detail in the HSC course. Electron configuration is not that important to know for HSC, but you still need to know about it, because it's part of the basics in chemistry and you need the knowledge to move on to harder concepts.
~shinigami~ said:
What is in the HSC? Stuff that's even harder?
Not sure about the hard bit you asked, as I'm quite enjoying it, nothing too hard to understand [for me] although it's alot more interesting than the prelim course [in my opinion]. So if chem's getting a little bit boring, just be patient and you will get to do the more interesting topics in the HSC course. :)
 
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~shinigami~

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Riviet said:
Not sure about the hard bit you asked, as I'm quite enjoying it, nothing too hard to understand [for me] although it's alot more interesting than the prelim course [in my opinion]. So if chem's getting a little bit boring, just be patient and you will get to do the more interesting topics in the HSC course. :)
Actually, chemistry is my favourite subject at he moment. Physics and maths are both a close second. :D
 

mitochondria

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~shinigami~ said:
Actually, chemistry is my favourite subject at he moment. Physics and maths are both a close second. :D
lol... That's good :D

According to my experience, the Prelim course was a lot more "Chemistry" than the HSC course. I don't recall reading anything about electronic configuration in the Prelim syallabus (my year 10 science teacher taught us that for fun though :D), things might have changed since "the old days" :p

HSC Chemistry is well-known to be poorly designed '-___-

Anyway, regarding your earlier question, quantum mechanics is basically a theory that describes the behaviours of very very very very very small particles (we're talking about atomic and subatomic scales) because they cannot be described by classical mechanics. It's a fantasbulous theory even though I'm still confused about most parts of it :D
 

~shinigami~

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mitochondria said:
HSC Chemistry is well-known to be poorly designed '-___-
How so?

Sorry to sound like I doubt you because I don't, I just want to know why? :p

mitochondria said:
Anyway, regarding your earlier question, quantum mechanics is basically a theory that describes the behaviours of very very very very very small particles (we're talking about atomic and subatomic scales) because they cannot be described by classical mechanics. It's a fantasbulous theory even though I'm still confused about most parts of it :D
Sounds interesting but confusing. :)

P.S Mitochondria, I just learnt about "mitochondria" in Biology today. What a coincidence. :lol:
 

mitochondria

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~shinigami~ said:
How so?

Sorry to sound like I doubt you because I don't, I just want to know why? :p
Maybe because I didn't do as well as expected in HSC Chem :p

It's perfectly okay to sound doubtful :D And that's the attitude for doing science subjects :p Umm... The way I see it (and many people I talked to) is that to do HSC Chem you need the minimal amount [slightly exaggerated] of problem solving skills because in many parts of the course they make you remember things without asking you to find out why.

For example, what's the point of remembering a few paragraphs regarding the properties and uses of a biopolymer without knowing the underlying organic chemistry that gives rise to those propertise? Yes, it does sound cool to be able to regurgitate the cool things [without knowing what is going on] about a biopolymer in front of people who know little to nothing about chemistry - but that's the first and last cool thing you can do with it.

Since we are at it, I might as well go on a rant about the board which sets the Chemistry syllabus and, as usual, the goverment. The last time I asked about someone-in-the-know I discovered that the board is not consists entirely of Chemists - it is in fact influenced by the government and people who don't know about Chemistry. I'm inclined to think that the copious amount of ethanol-related dot points in the syllabus (at least when I did it) has at least some governmental influence.

Our government thinks that science is dangerous, at least to our country's economy, and it has all sorts of weird and wonderful regulations on it. Science may be dangerous, but politics is definitely so.

After all that's just a superficial comment on what I personally think and I'm sure most politicians and economists will somehow prove that I'm wrong by either imposing more regulations on workplace safety (I know, it's good for us) OR give a detailed estimation which proves that scientists are very valuable and the country can't afford to lose them (so we might as well not have them).

Sorry about that :p


~shinigami said:
Sounds interesting but confusing.

P.S Mitochondria, I just learnt about "mitochondria" in Biology today. What a coincidence.
Yes :D I'm still very confused about quantum mechanics :confused: but it's very interesting :D

And yes... mitochondria :D
 

~shinigami~

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mitochondria said:
Maybe because I didn't do as well as expected in HSC Chem :p

It's perfectly okay to sound doubtful :D And that's the attitude for doing science subjects :p Umm... The way I see it (and many people I talked to) is that to do HSC Chem you need the minimal amount [slightly exaggerated] of problem solving skills because in many parts of the course they make you remember things without asking you to find out why.

For example, what's the point of remembering a few paragraphs regarding the properties and uses of a biopolymer without knowing the underlying organic chemistry that gives rise to those propertise? Yes, it does sound cool to be able to regurgitate the cool things [without knowing what is going on] about a biopolymer in front of people who know little to nothing about chemistry - but that's the first and last cool thing you can do with it.

Since we are at it, I might as well go on a rant about the board which sets the Chemistry syllabus and, as usual, the goverment. The last time I asked about someone-in-the-know I discovered that the board is not consists entirely of Chemists - it is in fact influenced by the government and people who don't know about Chemistry. I'm inclined to think that the copious amount of ethanol-related dot points in the syllabus (at least when I did it) has at least some governmental influence.

Our government thinks that science is dangerous, at least to our country's economy, and it has all sorts of weird and wonderful regulations on it. Science may be dangerous, but politics is definitely so.

After all that's just a superficial comment on what I personally think and I'm sure most politicians and economists will somehow prove that I'm wrong by either imposing more regulations on workplace safety (I know, it's good for us) OR give a detailed estimation which proves that scientists are very valuable and the country can't afford to lose them (so we might as well not have them).

Sorry about that :p
That was really interesting to read. :)

Yet another reason to dislike the Government.
 

mitochondria

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~shinigami~ said:
That was really interesting to read. :)

Yet another reason to dislike the Government.
Don't dislike the HSC though. Otherwise it'll get you back :D

Good luck!
 

~shinigami~

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mitochondria said:
Don't dislike the HSC though. Otherwise it'll get you back :D

Good luck!
If the HSC course is like the prelims course then it should be fun. :D
 

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