Elements Definition and 984 Threads

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!

For those interested.

If G is an abelian group, a in G has order m, b in G has order n, and gcd(m,n)=1, show that ab has order mn. I am able to show that (ab)^(mn)=e actually occurs. I am having great difficulty however showing that mn is the smallest such integer. I tried to assume that there were a smaller...

SO I am doing a Powerpoint for my Science class. Well anyways maybe you guys could help me out a bit. Which kind of bondings to Radio Active Elemenets (actinide and Lanthonide) use, and why? And what is so unique about Radio Active Element. If anyone could respond to this tonight I...

1. State in words the essential current, voltage, and resistance relationships in seires circuits and in parallel circuits. 2. From #1, how can I state those in symbols? 3. Why should the ammeter be placed in seires and the voltmeter parallel to the circuit component being tested? 4...

I am trying to gain insight in the transcriptional regulation of a few genes, but I am unsure what is meant with cis-regulatory elements and how they are different from trans-regulatory elements?

Darmstadt gets credit for new elements 110 and 111. The discovery of element 111 has been officially credited to the GSI laboratory in Darmstadt, Germany, by a joint working party set up by the International Union of Pure and Applied Chemistry (IUPAC) and the sister union for physics...

Which of the following atomic elements does not belong in the following list? Carbon, Neon, Silicon, Phosphorus, Iodine, Xenon

Besides the radioactive elements, do the other elements on the Periodic Table of the Elements have half-lives?

Is it true that the rarity of elements in the Universe increases as there atomic number increase? Or is that just a generalization? Is there a list that shows how much % of the natural elements that an element takes up, or just its rank in rarity? I've looked around, but can't find anything. All...

Out of all the 92 naturally-occurring, elements, ---------- and -------- are the only two that derive their names from those of people (and even then, not directly). Name both of them.

I downloaded that book from the physics Napster. It looks like something I should be able to handle, but I need help understanding some of the notation. "Any set called an index set is assumed to be non-void. Suppose T is an index set and for each t within T, At is a set. [inter] At =...

Total how many natural elements known to us? How many artificial elements produced in the lab?[?]

Explain how scientists are able to identify the elements in a star without sending a space probe question. I remember my teacher telling me that the answer was something about the spectrum, don't know what my teacher meant about it or what it means. Anyone can explain to me?