• Study Resource
  • Explore
    • Arts & Humanities
    • Business
    • Engineering & Technology
    • Foreign Language
    • History
    • Math
    • Science
    • Social Science

    Top subcategories

    • Advanced Math
    • Algebra
    • Basic Math
    • Calculus
    • Geometry
    • Linear Algebra
    • Pre-Algebra
    • Pre-Calculus
    • Statistics And Probability
    • Trigonometry
    • other →

    Top subcategories

    • Astronomy
    • Astrophysics
    • Biology
    • Chemistry
    • Earth Science
    • Environmental Science
    • Health Science
    • Physics
    • other →

    Top subcategories

    • Anthropology
    • Law
    • Political Science
    • Psychology
    • Sociology
    • other →

    Top subcategories

    • Accounting
    • Economics
    • Finance
    • Management
    • other →

    Top subcategories

    • Aerospace Engineering
    • Bioengineering
    • Chemical Engineering
    • Civil Engineering
    • Computer Science
    • Electrical Engineering
    • Industrial Engineering
    • Mechanical Engineering
    • Web Design
    • other →

    Top subcategories

    • Architecture
    • Communications
    • English
    • Gender Studies
    • Music
    • Performing Arts
    • Philosophy
    • Religious Studies
    • Writing
    • other →

    Top subcategories

    • Ancient History
    • European History
    • US History
    • World History
    • other →

    Top subcategories

    • Croatian
    • Czech
    • Finnish
    • Greek
    • Hindi
    • Japanese
    • Korean
    • Persian
    • Swedish
    • Turkish
    • other →
 
Profile Documents Logout
Upload
Topic 7_1_Ext C__The Bohr theory of the hydrogen atom
Topic 7_1_Ext C__The Bohr theory of the hydrogen atom

... accelerating charges. Since the hydrogen atom only radiates when its electron "drops" from one excited state to a less energetic state, Bohr postulated that "the hydrogen electron does NOT radiate energy when it is in one of its bound states (allowed by n). It only does so when "dropping" from a hig ...
Flexbook - What is Matter?
Flexbook - What is Matter?

View
View

Bonding - Berkeley City College
Bonding - Berkeley City College

... •The 'd+' and 'd-' symbols indicate partial positive and negative charges. •The arrow indicates the "pull" of electrons off the hydrogen and towards the more electronegative atom. ...
Spontaneous Emission Rates in Forbidden Lines
Spontaneous Emission Rates in Forbidden Lines

... to minutes). This makes the laboratory determination of transition rates extremely difficult if not impossible. In order to make use of these emission line diagnostics, we must therefore have highly reliable theoretical values for the involved transition rates that can only be achieved through compu ...
IO-IY
IO-IY

... 19. A diffraction grating is used in the first order to separate the wavelengths in the Balmer series of atomic hydrogen. (Section 27.7 discusses diffraction gratings.) The grating and an observation screen (see Figure 27.32) are separated by a distance of 81.0 cm. You may assume that () is small, s ...
Document
Document

Document
Document

... SOLUTION: (a) ClO4- is perchlorate; Fe must have a 2+ charge since there are 2 ClO4- ions. This is iron(II) perchlorate. (b) The anion sulfite is SO32-; therefore you need 2 Na+ for each sulfite. The formula is Na2SO3. (c) The ionic compound is barium hydroxide. When water is included in the formula ...
Relativity - BrainMass
Relativity - BrainMass

CHM 103 Lecture 11 S07
CHM 103 Lecture 11 S07

... • provides us with energy from food. • provides electrical energy in ...
Physics Today
Physics Today

Chromium: a spin qubit with large spin to strain
Chromium: a spin qubit with large spin to strain

prereq reading
prereq reading

... Bohr’s hypothesis was a combination of Rutherford’s atomic model, Planck’s quantum theory, Einstein’s photon theory of light, which proposed that the single electron revolves around the nucleus in a circular orbit. The energy being defined by the singly charged electron and nucleus (proton) and the ...
Theory of Chemical Bonds
Theory of Chemical Bonds

... the wave function of the atomic orbitals. During the calculation of the eigenvalues of the Schrödinger equation with equ. 4.15, we get integrals which contain the square of the wave function of an atomic orbital (∫ψ1*H ψ1dτ). These integral represent the Coulomb interaction energy between the electr ...
Unit 1: Basic Chemistry for Biology QUIZ STUDY GUIDE Things to
Unit 1: Basic Chemistry for Biology QUIZ STUDY GUIDE Things to

... -You will see 12 of them on the quiz tomorrow. ...
The angular part of the wavefunction, A(θ, Φ)
The angular part of the wavefunction, A(θ, Φ)

2002 Final Exam for Practice - Department of Chemistry | Oregon
2002 Final Exam for Practice - Department of Chemistry | Oregon

The Spectrum of Helium and Calcium
The Spectrum of Helium and Calcium

... Figure 1. Some energy levels of He, with an allowed and a forbidden transition to the ground state. 3c. Fine splitting. The 3 P levels in Fig. 1 are actually each split into three levels because S = 1 can add to L = 1 to give total angular momentum J = 0, 1, 2. Similarly, the 3 D levels are split in ...
Attachment: Click to download
Attachment: Click to download

... Atoms are so small, it is difficult to discuss how much they weigh in grams  Use atomic mass units.  an atomic mass unit (amu) is one twelfth the mass of a carbon-12 atom  This gives us a basis for comparison  The decimal numbers on the table are atomic masses in amu ...
Physicists realize an atom laser, a source of coherent matter waves
Physicists realize an atom laser, a source of coherent matter waves

Atomic Theory (2
Atomic Theory (2

June 2010 Regents Exam Part C Questions
June 2010 Regents Exam Part C Questions

Pdf
Pdf

Chap8_theatom
Chap8_theatom

... In water waves, the quantity that varies periodically is the height of the water surface; in sound waves, it is air pressure; in light waves, it is electric and magnetic fields. What varies in the case of matter waves?? The quantity whose variations make up matter waves is called the wave function, ...
Chapter 10
Chapter 10

< 1 ... 51 52 53 54 55 56 57 58 59 ... 137 >

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.
  • studyres.com © 2025
  • DMCA
  • Privacy
  • Terms
  • Report