The tag has no usage guidance.

learn more… | top users | synonyms

0
votes
1answer
78 views

Heavy Element Production from Supernova

When considering super massive stars going supernova, what are the heaviest elements that are predicted to be able to be created? So if the star VY Canis Majoris (1200 suns) were to go supernova, what ...
3
votes
1answer
57 views

Why do some elements burn different colors? [duplicate]

I have a torch lighter and it makes a green color when the flame passes over the metal in the center. What on the molecular level would a flame change color although there is no difference in ...
0
votes
0answers
20 views

What causes a materials distinc sound?

If a brass,iron and glass object emit a similar ring when struck yet all 3 objects are different in size,weight and structure, What do these 3 objects have in common to emit such a similar sound?
0
votes
2answers
63 views

How much Oxygen is in ΞΆ-phase metallic Oxygen?

I am playing with a sci-fi idea of Oxygen storage for breathing. I wonder how do some compressed forms of Oxygen compare to human-breath-Oxygen (room temperature, room pressure) in terms of density. ...
9
votes
1answer
5k views

What is so special about iron?

I remember reading something about how iron was a highly stable element. Ever since then, I have looked at iron fry pans with new-found respect. However, in a recent discussion I was unable to ...
1
vote
1answer
92 views

What is the desest material on earth? [closed]

Apart from the elements, do we know of materials that are denser? I.e. can an alloy be denser than the sum of its compounds, for example if the new lattice packs denser than each of the compounds it's ...
1
vote
1answer
65 views

Can we use a particle accelerator to create elements?

i'm a student of 11th grade. i studied about working of particle accelerators, cyclotrons in particular in a chapter of electromagnetism. i also read that the whole periodic table after element number ...
-2
votes
2answers
84 views

Could I create a banana? [closed]

As I understand it, until such time as stars were formed and heavier elements could be created, there was just hydrogen and helium, plus trace amounts of lithium an beryllium. Question: if everything ...
3
votes
1answer
228 views

How did neodymium magnets get their name?

Like in the question. Why neodymium magnets (Nd2Fe14B) are called "neodymium magnets"? Why not boron magnets? Or iron magnets?
3
votes
1answer
251 views

What is the heaviest element possible produced in a supernova?

So, I would imagine this question would have been asked here long ago but the suggested questions and Google is really letting me down now. So, as far as I can tell Plutonium is the heaviest naturally ...
3
votes
1answer
137 views

Why are the elements of the periodic table stable? [duplicate]

I apologize in advance for the stupid question, but I was wondering about neutron decay and elements. Taking for example one of the most simple elements, Helium. Helium is made by 2 neutrons and 2 ...
0
votes
1answer
45 views

Can an atom be formed from a combination of subatomic particles other than electron, proton and neutron (or their antiparticle)?

I have read that there are plenty of elementary particles. Can some of them form some species other than proton and neutron that are able to form a stable atom together with an electron or an electron ...
1
vote
1answer
24 views

How to choose which elements to use when synthesizing an ultra-heavy element?

I've been told that synthetic ultra-heavy elements are produced by bombarding a light nucleus into a heavy one, and that several combinations are (at least in theory) possible, as long as the sum of ...
4
votes
4answers
136 views

Why don't we have more elements?

By looking at the number of subatomic particles there seem to exist, there should be thousands of element configuration combinations possible. But we have found just over hundred elements to exist. ...
4
votes
2answers
100 views

Mountains and their local effects on Earth's gravity

I was once a truck driver and can feel the inertia and kinetic energy on heavy loads while traveling. While climbing mountains in the Rockies I noticed gravity was different on the side of the ...
1
vote
0answers
36 views

Where is lithium in universe? [duplicate]

In the theory of big-bang elements were formed in a particular order. Firstly hydrogen and in last iron formed. But at third no. Lithium was formed which should be present in enormous amount in ...
0
votes
0answers
48 views

element effect on quantum dot band gap

Main Question: Why do Au QDs have quantum confinement effects which change optical behavior from the bulk Au, whie certain other elements (such as Fe) are typically not shown to have the same ...
70
votes
6answers
19k views

Why are most metals gray/silver?

Why do most metals (iron, tin, aluminum, lead, zinc, tungsten, nickel, etc.) appear silver or gray in color? (What atomic characteristics determine the color?) What makes copper and gold have ...
9
votes
2answers
1k views

Why heavy elements don't sink to the core?

If earth assembled out of space dust, how come we find heavy elements like gold, silver, uranium and bunch of others that are heavier than iron on the surface? I mean silicon (Si mass 28.084) being ...
2
votes
2answers
195 views

Calculating the radius and potential energy of an atom?

Is there a general equation that gives the potential energy of any element at each energy level? I know that there is an equation for the potential energy of a hydrogen atom at each energy level but ...
0
votes
0answers
12 views

Does the spin-orbit interaction increase or decrease as one moves across the periodic table from boron to fluorine?

Does the spin-orbit interaction increase or decrease as one moves across the periodic table from boron to fluorine? I'm studying for a test. This is not homework. I just don't understand how to ...
1
vote
1answer
45 views

Are differences between elements besides the number of valence electrons negligible in forming matter and giving certain properties?

We were talking about life complexity, I don't know almost anything about physics, he told me that differences between elements beside the number of valence electrons are negligible and elements with ...
-2
votes
1answer
57 views

Characteristic Ka X-rays [closed]

In an experiment one observes the characteristic Ka X-rays of two elements at energies of 6.930 and 7.478 eV. The higher energy line is due to Ni. What element is responsible for the lower energy ...
2
votes
2answers
119 views

How massive can an atom get?

After reading this thread, it appears to me that creating a new element is a game of chance some sort of an art. It also appeared to me that the higher you go, the harder it is to make an element. ...
0
votes
0answers
22 views

Separating elements in a molten asteroid

I was reading some material about asteroid mining and diverse projected methods of on-site processing of the metals/gases, and that got me thinking about what would happen if the whole asteroid was ...
11
votes
1answer
424 views

Island of Stability

When I was much younger, I remember being fascinated by the thought of an Island of Stability at very high atomic numbers. However, I have not heard much on this and I was wondering Did this idea ...
-2
votes
1answer
51 views

Discovering new elements in zero gravity and in orbit?

Can we discover new elements in zero gravity of space and on other worlds with less gravity? To perhaps discover some of these elements, that we're having trouble producing here on earth? Would less ...
0
votes
2answers
40 views

Are known (“old”) elements being made synthetically using fusion?

Are known ("old") elements being made synthetically using fusion? I hear about research about making new heavy elements, but type "making known elements" on Google and nothing comes up. Are any known ...
7
votes
3answers
3k views

Is there a Tungsten alloy more dense than gold?

This thought came from researching a previous question. In the spirit of our get-rich-quick scheming I looked up element densities and prices near gold. Element (g/cm^3) (dollars/kg) Uranium ...
0
votes
2answers
1k views

How close are humans to creating gold from other elements?

Gold is made in supernovae. How close are humans to doing that? Or is it even possible to do that unless gravity is absurdly high?
1
vote
5answers
149 views

Superheavy… “Stars” production of super heavy elements w/o solar fusion

Just a soft question: Let's say a field of stars all die within a short amount of time. Just for argument's sake they produce a debris field of iron ( or any other heavy element). Provided that ...
1
vote
3answers
811 views

Is there any material that is NOT conductive and IS magnetically attractive?

Is there any material which is NOT conductive and IS magnetically attractive? I am in need of a material which I can shape and use within a machine. It must be very attracted to magnets similarly to ...
0
votes
3answers
2k views

Formula for critical mass? Critical mass of polonium?

I'm looking for the critical mass of Polonium; is there a formula? E.g.:$$\text{Neutrons / Protons}\cdot\text{ Constant = X kg}$$ There is a little table in the Wikipedia. E.g.: ...
3
votes
3answers
215 views

Do different plasmas from different elements have different properties?

If so, what are some differences? Like between iron and gold? EDIT: Sorry, I need to clarify: By 'difference' I mean... do they retain their chemical properties from more normal temperatures? Like is ...
11
votes
2answers
2k views

How is the number of electrons in an atom found?

I was wondering, what type of experiments were held to identify the number of electrons in an atom? (For example, how do we say that carbon has 6 electrons and magnesium 12.) I would like someone to ...
2
votes
0answers
49 views

How do experimental physicists know the decay path of transuranium elements ahead of time?

I have been watching (and enjoying) Dr. Poliakoff's YouTube videos on the synthesis of transuranium elements like Roentgenium and Copernicium, which decay so quickly that they are identified (if I ...
-1
votes
2answers
67 views

Creating elements without using the basic elements

Have there ever been created an element in the history (I'm talking about the 20 well known synthetics element) without using any other of the available elements from the nature? For example, element ...
2
votes
1answer
133 views

Is the rarity of elements related to their position on the periodic table?

I understand that most of the matter in the universe (aside from dark matter and energy of course) is hydrogen (74%) and helium (23-25%), leaving the remainder of the elements at only a few percent. ...
3
votes
1answer
112 views

Why are some elemental materials grey?

How does grey occur in elemental materials such as metals? I believe that grey arises from the simultaneous reflection and absorption of all colors of the spectrum (in different atoms of course), as ...
-5
votes
1answer
80 views

diffrent elements from diffrent elements [closed]

Do we get elements from other elements ? Somebody said they believed the world was visited by aliens and they made slavs of us and then amde us mine gold for them then they leave us to grow into what ...
4
votes
1answer
233 views

How do scientists estimate elemental-abundance in the universe?

I understand how cosmological observations can estimate the amount of 'baryonic matter' in the universe, but what I don't understand is how scientists can estimate the abundance of a particular ...
1
vote
2answers
67 views

When talking about atomic mass, how is $E=mc^2$ factored in? [duplicate]

When talking about atomic mass in the periodic table of elements, is this number the mass of the element at rest? If I understand correctly, the (relativistic) mass of an element will increase as the ...
4
votes
1answer
90 views

Where is quantum physics with regards to the periodic table?

In his Lecture's on Physics (circa 1960's) Richard Feynman wrote that so far physics has only been able to model (solve) the hydrogen and helium atoms. So now, more than 50 year's later where are we ...
3
votes
1answer
701 views

Why is cesium used to measure time in atomic clocks?

Seconds are measured by the frequency emission of cesium. Why is a frequency from the emission spectrum of cesium used as the standard in defining a second? Why particularly cesium?
1
vote
2answers
427 views

Do all elements spectrum lines fall within the visible light range?

I was wondering if whether we were extremely lucky to have found spectral (absorption) lines of astronomical objects because they fell within the visible light range or if there something intrinsic ...
4
votes
1answer
62 views

Lifetime of undiscovered element and its calculation

Reading about nuclear models, nuclear physics and the mythical ``stability island'' I just wondered about the next question: How can the lifetime of any undiscovered superheavy element be calculated ...
4
votes
1answer
70 views

Are there any established theories as to why dubnium-268 and 270 have such high stability for a trans-actinide?

Dubnium-268 has a half life of 29h and 270, 23.15h. I know of the island of stability but if dubnium is in it, the island is very small as only rutherfordium has isotopes that approach the same ...
-8
votes
1answer
206 views

Could Carbon 14 have been created before the Big Bang? [closed]

Here is my interest in learning about the source of Carbon 14(The Stuff I think they use for Carbon Dating). I might even be asking the question wrong, but here goes. Source of the Elements? Does not ...
7
votes
2answers
447 views

How were noble gases discovered?

Noble gases are chemically neutral. They don't react with anything. So, how were they discovered?
2
votes
1answer
32 views

Periodic Table and strong fields at high Z

There is a known "phenomenon" recalled by Greiner et al. in several of his books related to hypothetical elements with Z>172: in some point arount this Z, the nuclear field is strong enough to pop out ...