The Periodic Table

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orthocresol

00:54

@pH13-YetanotherPhilipp Get rid of homework policy altogether? I'm on board...

pentavalentcarbon

01:16

@pH13-YetanotherPhilipp The problem here is that finding duplicates can actually be hard, and is more more work than closing as homework for many reviewers. Finding duplicates is something we need to be better at in general.

The quantum numbers are $n,\;l,\;m_l$ for the orbital and $S$ and $m_s$ for the electron spin. The ranges are $l=0,\;1,\cdots n-1$, $m_l=0,\pm 1,\pm 2,\cdots \pm l$ and $S=1/2$ and $m_s=\pm 1/2$. You have $n=3,\ ; l=2,\; m_l=2$ making one of the $2l+1$ or five $3d$ orbitals. One electron makes $3d^1$. The $-1/2$ can only refer to the spin quantum number $m_s$ and is not usually included. — porphyrin May 19 at 22:42

> Stop answering questions in the comments section!!!!

2 hours later…

Avnish Kabaj

03:36

@orthocresol But that would mean users who post homework questions will stick around. After that the community will become more accepting towards homework questions.

Then boom

Quality drops

Q: marijuana testing process

Does anyone know a bit about how costly and accurate are the current THC measurement techniques? Please speculate what drives cost chemicals, consumables or instrument time.

I specifically remember that I voted to close it as unclear but my vote has been shown as too broad

After it got closed

O.o

o.O

Secret

03:51

@M.A.R.ಠ_ಠ Indeed, the worst error of gaussian

Because you cannot even start displacing the molecule without at least one SCF calculation

4 hours later…

pH13 - Yet another Philipp

08:10

@pentavalentcarbon Indeed there is a lot of work then, but as I said, in the end we would have more answered questions which will shatter a good light. But in the end, imo, it's about the answers and not about the work. The point about that it would be a lot of work is not a good point, I think ... just look at a lot of great answers here that have taken a lot of time and effort for questions that are worth the work, whatever this means.

paracetamol

08:23

@S.Chevalier Because I was... naughty? 8D

Looks around

Pats @andselisk and @M.A.R.ಠ_ಠ on the back

I can't ping andselisk for some reason :(

<--- Did something naughty/childish/regrettable, but now that I'm an adult (assuming an 18 year-old is an "adult") I have looked back upon my misdeeds and have resolved to become a model user (of sorts)! \o/

<--- Thought he'd play a "Russian bot" and upvote himself to influence social opinion and and draw parallels with the dastardly Russian "meddling" in the 2016 US elections O:)

For purely... academic, purposes O:) (Okay, I joke)

^ For the non-moderators that wanna know what happened

@Mart @ortho @Loong I have been reformed! Forgive me! \o/

Waves at @Mart

Martin - マーチン

👋

paracetamol

I can't see that ._.

Martin - マーチン

it's a waving hand

paracetamol

08:38

More correctly: That doesn't render on my screen :3

@Mart Oh? Thanks o/

2 hours later…

M.A.R. ಠ_ಠ

10:57

@Martin-マーチン no it's a facepalm. It's definitely a facepalm

paracetamol

11:17

@M.A.R Sniffle

3 hours later…

Secret

14:42

S. P. L. Sørensen

Søren Peder Lauritz Sørensen (9 January 1868 – 12 February 1939) was a Danish chemist, famous for the introduction of the concept of pH, a scale for measuring acidity and alkalinity. He was born in Havrebjerg, Denmark. From 1901 to 1938 he was head of the prestigious Carlsberg Laboratory, Copenhagen. While working at the Carlsberg Laboratory he studied the effect of ion concentration on proteins, and because the concentration of hydrogen ions was particularly important, he introduced the pH-scale as a simple way of expressing it in 1909. The article in which he introduced the scale (using t...

today's google doodle

1 hour later…

Abcd

16:11

Is it okay/allowed to ask "is my synthesis method for the compound correct?" type questions?

Loong

16:57

@paracetamol hi

pentavalentcarbon

17:37

People should go give a -1 to every answer that says sugar is a liquid: chemistry.stackexchange.com/questions/16563/…

pH13 - Yet another Philipp

glucose-fructose sirup

AbhigyanC

17:56

Where is everyone?

No one is answering the features questions though they're easy answers... It's like half this site is dead, or down for repair ;)

1 hour later…

Bounty Hunter

19:25

Q: Which invariant reactions are congruent?

I am studying the concept of incongruent melting and invariant reactions. I was wondering, would all the invariant reactions that I show below be incongruent? As I understand it, we can only have congruent melting when the liquid to which our solid melts to has the exact same composition, and by ...

materials

3 hours later…

1,3-feeds

22:17

Q: what to do if an answer is wrong but I don't have time to calculate the right answer

I saw this question: Find the concentration of proton after adding a acid to NaOH (before it was put on hold) where I believe the chosen answer is incorrect, because the chosen answer assumes that each molecule of $\pu{\ce{H2SO4}}$ is donating both protons ("each $\pu {\ce {[H2SO4]} mol}$ gives $...