Elements Definition and 1000 Threads

When calculating powers of cycles, are there any easy steps to use in doing so? I mean...is there a typical relationship when calculating (123)^n? Also, is it safe to say that a ceratin n-cycle should have order n or n-1? I guess any explanation of orders for group elements would be...

Which element in each of the following sets would you expect to have the highest second ionization energy? How do I figure this out? a. Na, Mg, Al b. Na, K, Fe c. Li, Be, Mg Can you help me? Thanks

Will on spring break earlier this year my dad informed me of a physicist who had recently passed away and who was responsible for detecting that all elements up to carbon(?) are formed in supernova. I have had a hard time searching for information on this man and his work and was wondering if...

Hi. On a general discussion forum, we were debating wether gold could be obtained from iron; I argued that this is possible, since we are at the moment recreating, in accelerators, even harsher conditions that those necessary for the creation of gold (i.e. those of a supernova core collapse). A...

i didn't know where to put this. can anyone tell me about any site from where i can download Euclid's "Elements" for free? thanks in advance.

Is there any cosmological observation that would suggest that once a star goes nova that its elements will not be recycled into another star, planet what ever ?

Hi! I'm having trouble answering some questions on a lab I did in class. Any help at all would be greatly appreciated! The purpose of the experiemt was to test the differences between pure substances (elements, compounds) and mixtures. If the procedure would help, here it is: 1. Mix equal...

Hello everyone, every row operation I make now is taking out the 0's i just made, any ideas on what I can do from here? Here is my work: http://img201.imageshack.us/img201/5573/lastscan2ah.jpg Also I was confused on how this works, my professor did an example: 3x+2y+z = 8; x = a y =...

Here is what the problem states. The most common elements found in organic compounds usualy bond covalently in the same fashion. This consistent bonding pattern or valence may be designated by an integer. For each of the following elements indicate its customary valence. Valence=number of...

All right, before reading this, please understand that I am only in my second year of study in high school. Bear with me... When looking at the activity series or metals and comparing it to the electronegativity and ionization energies of the elements, I noticed something quite interesting...

Hi everyone, My latest acquisition is an 8"-dobsonian mounted telescope, and I thought I'd try a bit of asteroid observing. What I would like to do is record the asteroid's position over the course of several observations and as a mathematical exercise, calculate its orbit. I know how to use to...

I found in a text that had this question. why should F, n row 2, be more reactive than iodine, in row 5, while Li, in row 2, is less reactive than Rb, in row 5? BUT this does not agree with this text http://richardbowles.tripod.com/chemistry/reactivity/reactivity.htm as it is more...

I remember hearing somewhere that one of the reasons people are trying to make elements which high atomic numbers is to see if they can be made to have long half-lives, such as uranium. In effect, they're virtually stable. However, I don't see how that can be. Here's why. Suppose element...

All elements are/ were made in stars, correct? Why is Earth predominated by certain elements and not by others? Does the composition of elements of other planets in our system differ from earth? If so, why?

Show that if G is a finite group of even order, then G has an odd number of elements of order 2. I'd appreciate a tip or two. I really don't see how the order of the elements of a group is linked to the order of that group.

Hello all, I'm re-learning chemistry on my own and have a quick question that I can't find the answer to in my book. Its about writing formulas. For example, aluminum chloride. I know that Al has a valence number of +3, and I know that Cl has a valence number of -1. So applying the...

Do you know any free software to draw elements or simulate chemical reactions ? I like the free ones :biggrin: Thankyou

I have encountered this set problem that seems simple enough at first glance, but I'm pretty ignorant about formal set theory and unsure of the rules. As I encountered it, this is how it was written: For any set S let P(S) denote all subsets of S. For example S={1,2} Then P(S)= {Ø, {1}...

Hi, I'm studying my astronomy course at the moment and i have question about the r- and s-process. As I understand it, in the r-process, the time between capturing two neutrons is shorter than the averge beta decay half life, right? So I'm guessing there have to be a lot of neutrons around for...

hi all, I am new here so if i break any rules please correct me er I am puzzled over an assignment and have no idea how to search for it, the question ask for the elements that was used to make semiconductor componets before it was replaced by silicon.. please help..a site help would do just...

Hello guys, I am following the chapter about multiple Riemann integrals in Apostol's Mathematical Analysis. Theorem 14.11 says this (I translate from spanish to english): "Let S be a Jordan measurable set. Let the function f be defined and bounded in S. Then f is Riemann integrable if and...

I'm looking for a trigonometry book that is rigorous, concise, insightful, etc. Something along the lines of Euclid's Elements, Spivak's Calculus, Rudin's Principles. I understand it's usually taught at the high school or college freshman level, but I'd like a book that someone who already knows...

1) why is the element fluorine added to tap water? 2) what element is believed to give lo.a moon of Jupiter its distinctive colour 4)what element was used to make semiconductor components before being replacedby silicon 5)where is triton found, please elaborate on it thanks kaluence

Hi, This time around I need to prove that a finite group of order 10 must contain an element of order 2 and an element of order 5. If the group is cyclic then this is trivial. So assuming the group is not cyclic, it's easy to show that there exists an element of order 2 in the group. And...

Is oxygen gas a chemical element? Is oxygen atom a chemical element? The oxygen element in the periodic table actually refers to an oxygen atom or oxygen gas that exist naturally in our surrounding air/atmosphere? Thanks to anyone that help and try to explain.

if a group of order 2p ( p prime) is abelian...then does it have exactly one element of order 2 ?? if a group is non abelian...i could figure out that there are p elements of order 2. but the abelian case is a bit confusing... also..is it like...any group of order 2p has an element of order p...

Hi, I've been having trouble erasing elements from a <vector> (that is from the STL of C++) See I declared 2 vectors V and S, V contains let's say all the elements, while S is a solution set which contains some elements that are classified... well yeah... I need to create V-S which is a...

A fuel cell runs off hydrogen and oxgen, would these elements be considered as biofuels? Is natural gas a biofuel?

Here’s an interesting question… Let R be a commutative ring and ‘a’ an element in R. If the principal ideal Ra is a maximal ideal of R then show that ‘a’ is an irreducible element. If a is prime, this is pretty obvious…if a is not prime, then we say a= bc for some b,c in R. Now we need to show...

here's a real tough one ( at least for me) ...show that the ring Z/mnZ where m ,n are relatively prime has an idempotent element other than 0 and 1. i looked at examples and it works... do we look for solutions of the equation a^2 -a = kmn , for some k in Z( that is, other than 0 and 1)? help!

Would someone mind (in simple terms if possible) explaining how at the beginning of the universe Hydrogen combined to give Helium; then then how Helium combined with deuterium to create the heavier elements? I would just like to be more versed on this process... Thanks for any help!

Guess I'll be flippin' burgers for the rest of my life guys... I can't figure out the difference between elements and atoms! I've searched the internet and wrote down their definitions and I e-mailed my prof. Here is how he explained it: > Atoms are the fundamental building blocks of matter...

How do you explain the colors of the elements with the free electron model?

It's easy when say zinc is +2 and chloride is -1, so it is ZCL2 However, say I wanted to combine say, oxygen and gold. Gold has +1 and +3 and oxygen is -2, which of the gold do I use? (+1 or +3, for example)

What elements of Gen. Chemistry I are important in II Besides balancing, limited reactions, etc...what will I reallly really need for II?

Hello all, first time to the site and its very helpful! I wish I would have found it sooner. I am stuck on quotient rings. Here is my question.. How do I find elements of a quotient ring? It asks me to list all elements of a quotient ring. Anybody have any ideas how i can find them...

Prove: a group of even order must have an even number of elements of order 2

I've got a question. It pertains to a proof I'm doing. I ran into this stumbling block. If I could show this I think I could complete the proof. G is a finite Abelian Group such that there exits more than one element of order 2 within the group. more than one element of the form b not...

Greetings, I just stumbled upon this site and thought someone might be able to help me. How many elements of order 5 are in S7? Are the elements permutations? I thought that S7 was a permutation of order 7. Also, are permutations cyclic groups? I know that permutations are a group and can be...

We mixed 3 ml of 1M copper solfate solution and 3ml of sodium chloride solution. This main copper ions are presented as Cu(h20)6 2+ We heated the test tube to produce cucl42- ions. This is part a) We placed 1M of copper2 sulfate solution in anoter test about 2 cm depth and slowly...

Going with the idea that every bit counts, in situations like: Can I reduce it to: without causing any browser compatibility/bug problems? In short, will classes and ids *always* win out over nonclasses and non ids, for all elements (div, p, etc.) and settings (position, width, etc.)? Or...

Currenly scientists are stumped (atleast that I know of) on how elements heavier than iron formed. This is because stars can't produce elements heavier than iron through fusion. After iron, fusion switches from exothermic to endothermic. Some people think these elements are created with the...

Is there a formula for calculating the atomic or covalent radii of elements, isotopes or ions?

let's asume that the higher we go, the more stable the element is, or so i am lead to believe. let's asume that at 160, it is perfectly stable. what would be the point? what i mean is, what could we use such a heavy material for? construction? AP ammo? engine blocks? it seems to me there...

During orbital’s filling with electrons, power areas form inside atom - with superfluous quantity of electrons and insufficient quantity. It causes overjumpings of electrons. My theory about such overjumpings see on www.genevo.org. I nead your comments

Hello guys/gals, I have a finite volume scheme to calculate the movement of a piece of yarn. This involves dividing the yarn into a number of finite volumes, the center of which is called a node. Collision with surfaces is somewhat of a problem. My integration scheme involves the following...

So why did we end up using the elments that we use for body things? Specifically, Na and K for the channels. Why is it that these two ended up being used? What is it about their chemical characteristics that make them so good at what they do? Also, with Ca, like you have Ca in your...

Most Fundamental Elements? Science continues to discover more fundamental elements with which to govern its predictions on and to unite a wider breadth of the universe. The latest, string theory, posulates, in laymens terms, that there are even smaller elements governing all aspects of our...

In a recent Discover magazine, the known elements were shown attributable to five geospheric regions: crust & mantle, soil, organismic, oceanic, and atmospheric. Does your natural philosophy favor this distinction or the structure of the more traditional periodic chart?

What is the difference exactly? Thanks!