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Franck-Hertz experiment with Ne-tube Related Topics
Franck-Hertz experiment with Ne-tube Related Topics

... from the Bohr model that just as electrons may make transitions down from allowed higher energy states to lower ones, they may be excited up into higher energy states by absorbing precisely the amount of energy representing difference between the lower and higher states. James Franck and Gustav Hert ...
4. bonding - New Hartford Central Schools
4. bonding - New Hartford Central Schools

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Review Questions

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The Pauli-Exclusion Principle Indistinguishability

... The last term from the Coulomb repulsion of the two electrons makes the separation of variables technique to solve the Schrodinger Equation impossible. However, if we could neglect this term, then the solutions are already known! They are just the hydrogen orbitals (one for each electron). The overa ...
4. bonding - New Hartford Central Schools
4. bonding - New Hartford Central Schools

Electrons in Atoms Powerpoint
Electrons in Atoms Powerpoint

...  Different wavelengths will show different colors  Each element gives off it own unique set of colors  Therefore each element gives off its own unique amount of energy ...
Chemistry Week 04 - nchsdduncanchem1
Chemistry Week 04 - nchsdduncanchem1

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12-3: Lewis Structures

...  Lewis structures—represent valence electrons; use dots placed around the chemical symbol  All atoms want to achieve a noble gas configuration o Octet Rule—most elements will be surrounded by 8 dots, representing noble gas configuration  Hydrogen is full with 2 electrons (2 dots on one side)—so i ...
No Slide Title
No Slide Title

... The metals in these two groups have similar outer electron configurations, with one electron in the outermost s orbital. Chemical properties are quite different due to difference in the ionization energy. ...
Bohr`s atomic model
Bohr`s atomic model

... would become smaller and smaller (see Eq. 4), and it would eventually fall onto the nucleus. We know that in reality this does not happen: atoms remain in stable states. • Bohr postulated, in an ad hoc manner, that electrons remain in circular orbits and do not fall onto the nucleus, and that they d ...
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Physics116_L31

... How does a photon know about “the other” slit? – Quantum theory says: it’s impossible to simultaneously observe interference (wave property) and know which slit a particular photon came through (particle) • To determine which slit it went through, you must absorb the photon! – We say: probability di ...
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ARRANGEMENT OF ELECTRONS IN ATOMS

... - When current is passed thru a gas at low pressure, the potential energy of some of the gas atoms increases. - ___________________________________________ - lowest energy state of an atom - _________________________________________ - a state in which an atom has a higher potential energy than it ha ...
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Final Exam Practice Problems Set 2

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PHY583 - Note 2a - Properties of Nuclei

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Chapter 5 Notes

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Chapter 8 - TeacherWeb

... A single covalent bond occurs when two atoms share one pair of valence electrons  A double covalent bond occurs when two atoms share two pairs of valence electrons  A triple covalent bond occurs when two atoms share three pairs of covalent bonds ...
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... 19. What is the name of the process in which the nucleus of an atom of one element is changed into the nucleus of an atom of a different element? A) decomposition C) substitution ...
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4.1-4.3 - BYU Physics and Astronomy

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Chapter 7: Electrons in Atoms Electromagnetic Radiation

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A brief history of particle physics

... proposed that the nucleon-like states (baryons), are made of three 1/2 spin constituents: the quarks. The mesons are quark-antiquark bound states. Baryons and mesons are called collectively hadrons. As in the nuclear case the simple interpretation of the hadronic charge multiplets is that the state ...
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Chemistry FINAL: CONTENT Review Packet

... retains the properties of that element h. a counting unit; 6.022 x 1023 i. positively charged subatomic particle j. subatomic particle with no charge ...
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1305- practise exam 2

... -------1. What is the term for the value which indicates the number of protons for an atom of a given element? A) Atomic notation? B) Atomic number? C) Atomic mass? D) Mass number? -------2. What is the term for the shorthand description of the arrangement of electrons by sublevels according to incr ...
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... numbers also result in small energy differences • Pauli exclusion principle: no two electrons in the same atom can be in the same quantum state • Electrons are grouped into shells and subshells • Periodic table reflects shell structure •Atoms with the same number of electrons in their outer shells h ...
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Atom

An atom is the smallest constituent unit of ordinary matter that has the properties of a chemical element. Every solid, liquid, gas, and plasma is made up of neutral or ionized atoms. Atoms are very small; typical sizes are around 100 pm (a ten-billionth of a meter, in the short scale). However, atoms do not have well defined boundaries, and there are different ways to define their size which give different but close values.Atoms are small enough that classical physics give noticeably incorrect results. Through the development of physics, atomic models have incorporated quantum principles to better explain and predict the behavior.Every atom is composed of a nucleus and one or more electrons bound to the nucleus. The nucleus is made of one or more protons and typically a similar number of neutrons (none in hydrogen-1). Protons and neutrons are called nucleons. Over 99.94% of the atom's mass is in the nucleus. The protons have a positive electric charge, the electrons have a negative electric charge, and the neutrons have no electric charge. If the number of protons and electrons are equal, that atom is electrically neutral. If an atom has more or fewer electrons than protons, then it has an overall negative or positive charge, respectively, and it is called an ion.Electrons of an atom are attracted to the protons in an atomic nucleus by this electromagnetic force. The protons and neutrons in the nucleus are attracted to each other by a different force, the nuclear force, which is usually stronger than the electromagnetic force repelling the positively charged protons from one another. Under certain circumstances the repelling electromagnetic force becomes stronger than the nuclear force, and nucleons can be ejected from the nucleus, leaving behind a different element: nuclear decay resulting in nuclear transmutation.The number of protons in the nucleus defines to what chemical element the atom belongs: for example, all copper atoms contain 29 protons. The number of neutrons defines the isotope of the element. The number of electrons influences the magnetic properties of an atom. Atoms can attach to one or more other atoms by chemical bonds to form chemical compounds such as molecules. The ability of atoms to associate and dissociate is responsible for most of the physical changes observed in nature, and is the subject of the discipline of chemistry.Not all the matter of the universe is composed of atoms. Dark matter comprises more of the Universe than matter, and is composed not of atoms, but of particles of a currently unknown type.
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