Atoms Definition and 880 Threads

Homework Statement Investigate The number of atoms splitting up in a nuclear reaction and Bacterial growth Your investigation should use appropriate formulae and graphs and include information from records of real events. You should aim to show how good the mathematical models are in...

Homework Statement Here is the problem in the book: Here is the solution: What I don't get is why the solution defines the fraction to be ni/(5*1022). Shouldn't it be 2*ni/(5*1022) since we have both donors and acceptors, so there are actually twice the number of atoms. Also...

when forming bond why do some atoms follow and some atoms [cations(d block )] don't follow octet rule and why does the formal charge should be lowered?

Assume a system of two hydrogen atoms. No other matter exists inside or outside of the system. Initial condition is one H with an electron in the n=2 state. That state decays to ground and emits EM that is absorbed by the electron on the second H. Repeat forever (maybe). Some questions...

Do atoms "generally" exhibit superposition when not isolated? Do atoms "generally" exhibit superposition when not isolated from the enviorment?I know that electrons and photons do but are regular atoms in the real world "generally" in a state of superposition without all the scientific...

What is electric charge? Electric charge is the physical property of matter that causes it to experience a force when close to other electrically charged matter. So, if the particle has electric charge, there is an electric field around it. What is a Neutral particle? In...

i do not know why. does the magnetic moment of an atom come only from the spins of the electrons?

I'm aware that there are certain unique configurations of atoms often referred to as exotic atoms. One type of these atoms involves the substitution of an electron with a muon in hydrogen. The relatively large mass of the muon results in the size of the hydrogen atom decreasing (which is the...

Can atoms/ ions/ molecules behave quantum mechanically at bio-friendly temperature? For example, cells in the human body needs around 37 degree Celsius to function properly. There are however some organisms such as Tardigrade ( which can survive for a few minutes at -273°C and for days at...

So how much denser than is a neutron star than an atom? Is it called a neutron star because electron's orbital effect no longer exists/acts the same, so as to no longer cause 99.99% of everything to be space?

here polarity in an atom is although chemistry topic but my problem is related to QM my question is that how electrons revolve around the covalently bonded atom where the electrostatic forces of attraction causes them to stuck at a single point. but if this assumption is wrong then correct me...

Homework Statement Why, IF electrons really orbited atoms, would they lose energy? Homework Equations The Attempt at a Solution I realize they're meant to emit light. But why? I understand vaguely that the E field might be changing with time, since you have a changing magnetic flux... but...

How does an atoms "life" end? Two stupid questions. What "force" keeps the electrons spinning around the nucleus in an atom, and how does an atom eventually "die", or wear out? Thanks for a serious answer, I really have no idea. :frown:

Hi, N atoms are arranged to lie on a simple cubic crystal lattice. Then M of these atoms are moved from their lattice sites to lie at the interstices of the lattice, that is points which lie centrally between the lattice sites. Assume that the atoms are placed in the interstices in a way...

Hello Homework Statement A gas of atoms, each of mass m, is maintained in a box at temperature T. The atoms emit light which passes (in the x-direction) through a window in the box and can be observed as a spectral line in a spectroscope. A stationary atom would emit light at the sharply...

I was wondering if a quadruple bond between two carbon atoms would be possible. I found this on wikipedia about "dicarbon": http://en.wikipedia.org/wiki/Diatomic_carbon, which is related to this question, since what I'm describing is an isomer of dicarbon. Anyone have any ideas?

A recent APOD page discussed jets ejected from black holes. It said, "Recent evidence indicates that these jets are composed not only electrons and protons, but also the nuclei of heavy elements such as iron and nickel." What is thought to be the mechanism of production of these heavy nuclei?

Homework Statement Landau&Lifshitz Vol. Mechanics, p101 Q1Find the moment of inertia of a molecule of collinear atoms Homework Equations The Attempt at a Solution I defined the origin alone the orientation of the molecule. I_3=0 obviously. For I_2 I wrote I_2=Ʃm_b[x_b-\frac{Ʃm_a x_a}{μ}]^2...

Homework Statement "A gas discharge tube contains H 1 , H2, He 3 , He4, Li6, and Li7 ions and atoms (the superscript is the atomic mass), with the last four ionized so as to have only one electron. (a) As the potential across the tube is raised from zero, which spectral line should appear...

An atom of mass m1 = m moving in the x direction with speed v1 = v collides elastically with an atom of mass m2 = 5m at rest. After the collision the first atom moves in the y direction. Find the direction of motion of the second atom. ________ ° counterclockwise from the +x-axis Find the...

People normally talk of electrons performing oscillatory motion when an electromagnetic field is incident on an atom. But, won't the electric field of the E.M. wave cause the nucleus of the atom to vibrate...? . "Note: Here I am talking of isolated atoms, that is atoms of noble gases, and not...

Greetings Pfers I am curious what breakthroughs need to be made for the completion of a device capable of forming an atom out of the basic subatomic particles (protons, neutrons and electrons). Technology is advanced enough to where we have machines capable of generating these subatomic...

Homework Statement The potential energy of two atoms separated by a distance r may be written as: U(r) = 4Uatomic * [(r0/r)12 - (r0/r)6] >Given r0 = 4.0 Ao and Uatomic = -0.012795 eV, what is the distance at which there is no net force between the atoms? Express your answer in terms of...

Well, what do you think? And why do you think what you think?

1. The problem is in the attachments 2. Basic chemistry knowledge 3. The radius of one Rb atom is 4.95/2 time 10^-8 cm, we calculate the area then divide 9 into the area of one atom, we get the number of atoms, why is 4.7 x 10^15 atoms wrong?

So let`s say that we have a chemical reaction with liquid oxygen and liquid hydrogen, but we`ve got very little hydrogen, and very much oxygen. As we pour these two liquids together they react with on another and create water. However since there was a very much bigger amount of oxygen than...

A common example of this is that when bringing N hydrogen atoms together into a ring. Far apart, assume each electron exists in the 1s state. As we bring them together, instead of each electron staying at the original 1s level, or all of them changing by the same amount, the 1s level fans out...

Hi guys, I hope you don't mind me posting here, I am doing some research into atoms, molecules and microscopes. I have no knowledge of physics, the quantum world or microscopy so if my questions seem silly, please look past that and help me. Thank you I have two questions. Is there a way...

Hi, I'm sorry if I've hit the wrong subforum. Although physics is not my strong side this question has been puzzling me for some time now and from I've read so far - there's no clear answer yet. Here's the question: If we take an atom and mark it's position in space at time X and then it's...

In the case of an atom of Cesium ejecting an electron, it would lose one electron from the 6s orbital. The 6s orbital is very high in energy and similarly so would the electron that is ejected from it, right? So if there was a Nitrogen atom as well, how would it be possible that the Nitrogen...

I had a multiple choice problem on my pop quiz. How many oxygen atoms are there in .00334 grams of CaS04 X 2H2O. The molar mass is 172 g/mol. So .00334/172 = 1.9 x 10-5 moles x 6 since there are 6 oxygen x 6.022 x 1023 = 7.016 x 1019. None of the answer choices had that. Did I do it wrong...

Do Elementary Particles "Jiggle" Like Atoms? Like the question says, if atoms jiggle about because their constituent sub-atomic particles are moving within the atom, is this movement simple orbital/linear displacement or is there also a "jiggling" to it? If there is a "jiggle" or vibration...

I am not in Atomic physics, Everywhere is the standard picture of a bond with 2 atoms sharing 2 electrons. Why is it not possible to share 3 or more electrons that it would form something like a tetrahedron (see attachment)

That is what I wondering. When you put a ferromagnetic conductor in a strong magnetic field, the ferro conductor is strongly attracted because of induced strong magnetic dipole moments inside the conductor. My question: are all or (atleast a large portion) of the atoms of the conductor...

Homework Statement Zinc has a density of 7.17 Mg/m^3. Calculate (a) the number of Zn atoms per cm^3, (b) the mass of a single Zn atom and (c) the atomic volume of Zn. Homework Equations atomic mass of zinc = 65.39 g/mol The Attempt at a Solution For part (a) I use the fact that...

according to Einstein all atoms in solid vibrating with the same frequency , while in the Debye's mode there are a band of frequency i.e not all the atoms would have the same frequency, my question is that , that is the idea behind the Debye's model? or why the frequency of vibrating of atoms...

Can we see atoms or other atomic stuff like electrons and protons, etc.? If not, how can we know they exist and how they behave?

What would happen to the XRD pattern if instead of having spherical atoms, we had triangular atoms? I found the optical diffraction pattern for a triangular aperture, but I'm not sure if optical diffraction patterns would be the same as XRD patterns.

I am trying to get a better understanding of what it means for an atom to vibrate. Let's say there is a chunk of iron in deep space that starts out with a temperature of 50 degrees celsius and is rapidly losing thermal energy. I will make the following assumptions: 1. The iron has thermal...

Homework Statement Write an expression E for the average kinetic energy of Helium atoms using the Boltzmann constant. Homework Equations PV = nRT PV = \frac{1}{3}mN\overline{c^2} k = \frac{R}{N_A} [P - Pressure ; V - Volume ; m - Mass of an atom ; N - Number of atoms ; others have...

Hi, everybody. I wanted to ask you about the question that really tortured me for quite a long time: Does electrically neutral atom have energy above 0? I mean what would happen if you have measuring instruments and they tell you energy is 0, but the energy of atom is still there-potential...

why nuclear radiations occur in atoms with large nucleus?Is it the weakening of residual strong force? If so why it gets weak ?

What happens to atoms such as gold, lead, and other heavy elements when they come into the Earth's atmosphere as cosmic rays traveling at close to the speed of light? I know that supernovas are generally the only natural place where atoms heavier than iron are formed, and they also shoot out...

Homework Statement Given a crystal (cube) with regularly arranged atoms (Total 27 atoms) The mass of each atom is 3.5*10^-25. The density of the crystal is 9.2*10^3 What is the shortest distance between the centres of two adjacent atoms? Homework Equations density = mass / volume The...

(PF members Salman2 and ftr have already mentioned this in two threads, but I think it deserves it's own thread :smile:) Hydrogen Atoms under Magnification: Direct Observation of the Nodal Structure of Stark States Abstract: To describe the microscopic properties of matter, quantum...

Is it possible to "build" atoms? Was just thinking to myself, the world running out of resources etc... the most basic form of matter is the 3 subatomic particles... and all matter is made up of them. i did some googling but couldn't find much so I am wondering if one day it would be possible...

Here's the introduction of the paper by Freidel and Hnybida. Quantum geometry is built up of chunks of geometry that contain information relating to volume, areas, angles made with neighbor chunks, etc. The Hilbert space that these chunks (called intertwiners) live in needs a set of basis...

I was wondering if it was possible to extract individual gluons from a nucleus, and if so, how?

It is often stated that quantum mechanics is able to explain the stability of atoms. I think most explanations are cheating b/c the compare apples and oranges. There are two reasons in classical theory which indicate that atoms should be unstable: A) there is no minimum for the orbit; the...

"... the first direct evidence of pear shaped nuclei in exotic atoms. The findings could advance the search for a new fundamental force in nature that could explain why the Big Bang created more matter than antimatter—-a pivotal imbalance in the history of everything." Any insights...