/sci/ - Science & Math

which elements do you guys think are the coolest?

ill say titanium seems pretty cool for its biocompatibility but i can't decide on the best

for an honorable mention, neodymium and rare earth metals for giving us cool magnets

>>9944871
This is the universe, at least it's what you would find in it.
Feel free to explore it, you can thank me later.

How do i figure out how many electrons there are in the S, P and D shell?

Will we ever see the period 8 or more, lads?
I think we were born too early to see the glorious and finished periodic table

Why aren't you studying chemistry /sci/? Unlike physics or whatever liberal arts bullshit biology is, Chemistry is 100% applicable to real life and helps you understand the basic processes of life. If you aren't studying chemistry you are basically wasting your time.

I need some clarification. "Electrochemistry to 1860" is the topic relating to electrochemistry strictly only to the 1860's or from the beginning of electrochemistry to 1860?

Why do protons, which determine atomic numbers, match up perfectly from 1 to 118? For example, the last element discovered, Ununoctium, has 118 protons. Is this just a coincidence? How come there are, for example, simply no elements that have 55 protons? Why aren't there any gaps?

need answers:

a) What mass of calcium fluoride (in grams) will precipitate when 100 mL of 0.100 M sodium fluoride solution is added to 16.1 mL of 0.100 M calcium nitrate solution? Assume calcium fluoride is totally insoluble (include 4 decimal places in your answer)


b) How many moles of hydrogen gas molecules will be formed by the reaction of 13.5 g of zinc metal with excess dilute nitric acid? (include 4 decimal places in your answer)

c) 17.3 mL of 0.100 M sodium hydroxide solution is required to reach the endpoint when added to 20.0 mL of hydrochloric acid solution. What is the molarity of the hydrochloric acid solution? (show four decimal places in your answer)

>>7198543
ok.

Quick tip, get a periodic table and print it off, or at least save it. Seriously helpful, this one is pretty good as it has the molecular weight of each element (the weight of 1 mole of it)

Fluorine: F is found in the 17th column and the second row of the periodic table, and is the 9th element. 2 ways to figure out the valence electrons.

1. Its column. F is in column 17. This would mean that it has 7 valence electrons. The same can be said for all other element in column 17 (Cl, Br, I, At).

2. Its periodic number. Not sure if youve learned this, but atoms (at least at the level you need to know) have electrons that fill its shells. The first shell that is filled is closest to the atom and can fit only 2 electrons. The second and third shells can both fit 8 electrons. Fluorine is number 9, meaning it has 9 protons. This means that a stable atom of fluorine also has 9 electrons. 2 fill the first shell, then there are 7 left over. They dont fill up the outer most shell, so they are valence electrons. Chlorine for instance would also have 7 valence electrons, as it fills up the first shell of 2, then the second shell of 8, and then 7 in the next shell (17 electrons for 17 protons.

Im sorry if this is long and shitty but Im not too sure what understanding of chem you have so im going pretty slow

How much of the periodic table do you think one could slap onto a single organic molecule? What do you think said molecule might look like? Let's not concern ourselves with getting it on there.

You know how certain elements have unstable isotopes that emit radioactivity and slowly decay over time into totally different elements? Eg. Uranium and Lead.

What if every element on the periodic table was just a result of a similar situation with the very first element? Kind of like a domino effect.

I have 2 questions:

1. If this is a plausible theory, what do you think this original element is?

2. We can't know that all the elements on the periodic table so far are all we will ever discover. So is it possible that some current elements will decay into completely undiscovered ones in time?

Is it worth it to get a degree in Chemistry?

Scientifically, what is the possibility that Moot is a nigger? Please explain the procedures.

Hey /sci/,
I have an Orgo test on structure determination coming up and I'm not quite sure the best way to approach the problems. Basically, using given Mass Spec, IR spec and NMR graphs, I have to identify the formula and structure of the molecule in question. Do you guys have any tips for how to systematically approach these questions? A list of objectives that I can go through to determine the identity of the molecule would be along the lines of what I'm looking for.

Okay /sci/ people, I need some assistance. I have to type a paper about 'Important Discoveries in Chemistry.' I have malleability, the atomic theory, protons, electrons, neutrons, oxygen, and popular things like that.
What I need is just a little information on some other things that are important in Chemistry. Anything you know would help. Thanks.

I didn't pay attention too well in class and I have a question about moles and titration. In class, we diluted 10ml of NaOCl with 100ml of H2O. Now, I am supposed to calculate the number of moles of NaOCl in the bleach sample using the equation NaOCl + H2O --> NaCl + H2O (l) + O2 (g). Can someone please explain to me how this is calculated without giving me an answer?

I really hate to be a bother, but I'm at my wits end here. I'm in chem 101 and we're doing redox reactions right now. The professor gave us a set of problems to complete with answers, but I can't seem to get the correct answer. Here's one.

For the following balanced redox reaction, how many electrons are transferred?
2 HNO3 + 3 H2S  2 NO + 3 S + 4 H2O

Being that nitrogen is reduced gaining 3 electrons and sulfur is reduced gaining 2, I really want to say 5. The answer sheet says 6.

What exactly am I doing wrong?

Is it possible that there are elements that have not yet been discovered?

Is it possible there are quite a few?

If so or not, why?

Hi /sci/, do you guys have any tricks or tips for memorizing the periodic table? I only need to memorize the symbols and names.

So as we discover more and more synthetically produced elements, their half-lives are getting shorter and shorter. Is there a possibility that we might eventually break some sort of threshold where we can get produce new elements that are either stable or have 'long'(loaded word, since long can mean anywhere from an element lasting a few minutes to millions of years) half-lives?

Why is chemistry boring and irrelevant?

Transuranics are elements with an atom number higher than that of Uranium, actinides are elements with a number higher than that of Actinium. Transuranics and actinides overlap to some extent, check the periodic table(all the way at the bottom).

The life they're talking about reflects the stability of the elements. Long-lived isotopes are radioactive, but emit their alpha, beta or gamma radiation slowly, over the course of several hundreds, thousands or even millions of years, so they don't pose an immediate health hazard since brief exposure means that you get exposed to less radioactivity. However, since they are long-lived, they're harmful for a long period of time and are hard to get rid of(eg nuclear waste). Short-lived isotopes are an immediate danger, since they give off large amounts of radioactivity in a short time span, but they also lose their radioactivity quickly as a result and are not generally a waste problem.

here is a periodic table.
as you can see this atom doesnt exist because none of these have a mass on 10