Elements Definition and 984 Threads

Homework Statement What information can i find on the periodic table of the elements and what does it mean Homework Equations What is anything. The Attempt at a Solution Atomic symbol, the big letter, for the element abervation. The elements name, for the elements name. Atomic...

Homework Statement Let F be a finite field. Show that the product of all non-zero elements of F is -1. Homework Equations An example of this is Wilson's Theorem. The Attempt at a Solution Let G be the multiplicative group of non-zero elements of F. Then G is cyclic. Let a...

prove that if G is a finite and abelian group and m is the least common multiple of the order of it's element, that there is an element of order m. My idea: if ai are the elements of G, the order of a1*a2 is lcm(a1,a2) and the result follows directly when applied to all ai... but why is this...

Why there is on Earth stronger abundance of light elements. I mean elements that have proton number lower than 30. And are there any elements in nature in elemental(atomic) form?

Hi, everyone: I have been playing around with tensor products of vector spaces recently. This question came up: How can we tell if c(a(x)b)~(a(x)b) , or wether any two general elements are in the same class, other than in the std. cases like c(a(x)b)~(ca(x)v)~ (a(x)cv) ...

can anyone explain me the 1>significance 2>elements used to construct them 3>main usage to which industries of heat exchangers?

My understanding of analyzing emission spectra is that when the quantum number of an electron decreases (i.e. when it falls closer to the nucleus) it emits energy. I understand that this is a very basic understanding but I have not yet made it to college, so please bear with me. :) Now, what I...

Hello all Just a simple question that intrigue me recently. Some body could explain about how scientists exactly know that transuranium elements cannot be produced naturally in the Universe? JPAM

Hello, this is my first time posting... We're working on a cartoon for science class, and I was wondering if anyone knew the answer to a bit of a dilemma I have... If you take a single fragile, radioactive element and bond it with another fragile, radioactive element, is there a good...

Hi all, I'm trying to express a given requirement in a software system. I'm used to UML and UseCase specification, but I thought I would attempt to learn Zed Specification (which is based off logic, set theory., etc... so those topics too!) Given two sets of data e.g. in Zed notation...

As we have seen some mathematical sign lately in this group, because I put you in the drawing of the general sign of any element. You also can see more searching “from zero to infinite, ferman”. Thank you.

What research steps must be taken before we are able to convert hydrogen into carbon, oxygen, potassium, and so on? My quick estimate is that we may be able to do this with a particle accelerator and bombard hydrogen with neutrons and protons, with some massive amount of energy loss in the...

Homework Statement This is not HW per say, I'm just wondering what the elements of Alt_4 are (the subgroup of S4 consisting of all even permutations). I know Alt_4 is of order 4!/2=12, and I have so far that Id, (1 2 3), (1 2 4), (1 3 4), (2 3 4), (1 2)(3 4), (1 3)(2 4), (1 4)(2 3) are in...

which pair of elements is most apt to form an ionic compound with each other? nitrogen and hydrogen or barium and bromine? please explain

Forces between two current elements and Newton's third law Consider two non parallel wires each carrying a current which located at one plane surface. According to electromagnetic theory, the forces between two straight and solid wires mentioned can be estimated as follow: F= i . (L x B)...

Ok so I just started taking this Bio 12 class after not being in High School for over 5 years! It is not what I thought it would be at all! Im kind of getting stuck on one topic and no matter who I talk to I still don't understand it. What is the dif between Atoms and Elements? I...

What does the electrical conductivity of the elements depends from?

1) If we have 5 letters: A, A, B, C, D, in how many ways (arrangements) can we form a 3-letter "word"? How can I calculate this? The 2 A's seem to make things very complicated...and I have no clue how to do it... It's arrangements, so I think permutation will be used. Also, there are...

Why do some elements, particularly the heavy ones, require melting for them to bond with other elements to create metals containing differing atoms? What role does temperature play in the form, conform, and inconform states of elements? And what role do the elements play in requiring...

Problem 1: The class of ternary compounds called carboranes (containing the elements carbon, boron and hydrogen) have played a prominent role in many areas of fundamental chemical research. In particular, they have provided many interesting examples for testing theories on chemical bonding...

Homework Statement If P(A) =0.4, P(B)=0.5, and P(A∪B)=0.7, find P(A’∪B’) The Attempt at a Solution P(A’) = (Probability of all elements in S that are not in A) = 1 - P(A) = 0.6 P(B’) = (Probability of all elements in S that are not in B) = 1 – P(B) = 0.5 P(A’∪B’)= The...

Homework Statement Prove that in any group the orders of ab and ba equal. Homework Equations n/a The Attempt at a Solution Let (ab)^{x} = 1. Using associativity, we get (ab)^{x} = a(ba)^{x-1}b = 1. Because of the existence of inverses--namely a^{-1} and b^{-1}--this implies (ba)^{x-1}...

Homework Statement Let G be a group with order \left| G \right| = 60. Assume that G is simple. Now let H be the set of all elements that can be written as a product of elements of order 5 in G. Show that H is a normal subgroup of G. Then conclude that H = G Homework Equations The...

What are the properties of SO(4) group? , How this acts as a rotator in 4 dimensions?, What are the elements of Rotation matrix in a specific dimension among four dimensions?

Homework Statement For the problem at this site http://www.kalva.demon.co.uk/putnam/psoln/psol859.html, how an array with n^2 elements contain 8*n elements (8 for each positive integer) when n is not equal to 8? Does that type of algebra not work with an infinite number of elements...

Nowhere in my notes does it say what Eθ is and i can't find a definition of it on the internet :confused: I'll give you the context: For group 2 of the periodic table, state and explain the trends in the following for their elements: (i) redox property, related to Eθ value

Can anybody please tell me why NH3 readily forms complex ions with transitional elements but NH4+ doesn't?

Homework Statement Can there be a mapping that may not map any elements from one domain to another? The reason is that the mapping has a condition. For example, it will only map elements if the one in the domain are related in some way to the element they are mapped to (i.e congruence via a...

I want to know how one purchases pure elements. Like Caesium or Neon or Chlorine. Do you need license to purchase some elements? Or do you need to be affiliated to some sort of organization? Where is a site that has prices for the elements? Just curious how one gets a hold of these...

As far a I know it's only the combination of Hydrogen, and Oxygen Atoms that cause explosion/burn, and that if there's other atoms in the mix it just causes a slower reaction. Is this true, if not then what other atoms cause explosion/burn?

Homework Statement How do you factorise polynomials in Z[x]? Z is not a field so you can't use the theorem 'a is a root of f <=> (x-a) divides f' The Attempt at a Solution Would you map the polynomials from Z[x] to Q[x] by multiplying by 1, since all elements in Z[x] are in Q[x]. Then...

Hi. I am just wondering, is there any notation i can use to refer to elements ONLY in a certain set. Usually, given sets A, B and C, i could refer to elements of only set A as A \cap \overline B \cap \overline C, but is there some notation that specifically refers to elements ONLY in a certains...

Using the theorem that in any boolean ring a+a=0 for all a in boolean ring R. Then 0 is in R. Make the multiplicative identity 1 is also in it. Therefore R can only take 0 and 1 and no more because 1+1=0. 0+0=0. 1+0=1 always. So 2 or other elements can never occur.

Elements of Mathematics : Algebra I Chapters 1-3 by Nicolas Bourbaki Is this a worth while book? I wouldn't mind reviewing my Linear Algebra and Abstract Algebra which to all be included in the textbook plus more in a condensed way. Sounds perfect. Reading my old textbooks just gets...

Okay guys need to know why The Group I and Group II elements of the periodic table are sometimes called the "s" block? Sorry for the vaigness of the question this is what they gave me. Cheers

Where is the religious outcry over the manufacture of synthetic elements? To be clear, I am talking about elements which have more protons in their nuclei then are in uranium nuclei. Although it is possible that some of these elements exist naturally somewhere in the universe as a result of...

Trans-uranium element production is more often confirmed from decay products. But would such a new atom be overlooked if stable? Recently, element 118 occurred in one out of 1019 collisions, and was most readily detected by its signature radiation.

Hi. :) Look what I've found here http://math.ucr.edu/home/baez/nth_quantization.html" Can anyone say is this nonsense or what, negative cardinality? I am very curious. :o

Stable SuperHeavy Elements I'd read that a new "island of stability" of long-lived SuperHeavy elements is about to be reached. http://en.wikipedia.org/wiki/Island_of_stability The recent synthesis of Hassium-270 showed a surprisingly pleasant half-life of 30 seconds. That's pretty...

Can anyone offer any help with these questions? Question 1: In each part specify the set by listing its elements: { x | x Є Z and (x+1)² < 10 } Answer: am i supposed to write out all the possible x's, so that my answer would be: {0,1,2,-1,-2,-3,-4} or do i write out the over...

Hello! First I am new at this forum and would like to say hello to everybody :) Second- I am looking for a good tutorial on artificial Earth satellites orbit perturbations. Can somebody give me an advice where I can find it? Do you know any propagation algorithms for artificial satellites that...

How would one acquire an isotopically pure sample of an element? Are some available for direct purchase, or would it have to be done in-house with some sort of large centrifuge apparatus? (Im thinking about transition metals, not actinides)

Hi there, I'm trying to figure out how this works but I'm not having much luck. Doesn't help that I'm not a science person to start with, so I'm hoping somebody here can help me out. I understand the basic idea that if you have 2 Hydrogen atoms + 1 Oxygen atoms you can somehow convert the...

confused on the "divides" relation, find all greatest, least, maximal, minal elememen Hello everyone I'm not sure how I'm suppose to do this... The problem is the following: Find all greatest, least, maximal, minimal elemnts for the relations. It says to find that on exercise 16b. I...

"Generation" of gold, silver, copper elements Since gold, and silver, and copper are all elements, I am a little confused - are they generated, or is there already only so much of each in the Earth, period? I know I found some data on Wikipedia that indicated that the various elements can be...

My lecture notes state that every element of a group belongs to exactly one right and one left coset of a certain subgroup, but I don't see why this should be the case, so I tries to prove it: with S and S' elements of the subgroup H of G we then have that if a certain element X of the group...

Hello everyone. There arn't any problems like this in this section, so I'm kind of lost on what they want. It says... Let S = {a,b,c} and for each integer i = 0, 1, 2, 3 let S_i be the set of all subsets of S that have i elements. List the elemnts in S_o,S_1,S_2,S_3. Is {S_0,S_1,S_2,S_3}...

Simply put, does it ever change? That is, does the line spectrum of a particular element or compound ever change? I've been searching all over, but I'm getting different answers!

Calculate the percentage by mass of the elements shown in the following compounds A) Br in MgBr[SIZE="1"]2 b) O in Ca(NO[SIZE="1"]3)[SIZE="1"]2 c) N in NH[SIZE="1"]4NO[SIZE="1"]3 any help is appreichated thanks regards

http://img68.imageshack.us/img68/51/problem120ha2.jpg Use conservation of energy to solve for V_0. P_1\,=\,(30V)\,(-6A)\,=\,-180W P_2\,=\,(12V)\,(6A)\,=\,72W P_3\,=\,(V_0)\,(3A)\,=\,(3V_0)W P_4\,=\,(28V)\,(2A)\,=\,56W P_5\,=\,(28V)\,(1A)\,=\,28W P_6\,=\,(10V)\,(-3A)\,=\,-30W...