• 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
Honors Chemistry
Honors Chemistry

Course Title (1) Brief Course Description Modern Physics involves
Course Title (1) Brief Course Description Modern Physics involves

... Modern Physics involves the extremes of very small distances and velocities close to the speed of light. These extremes demanded new theories in the early part of the 20th century and yielded the weird and wonderful results of Einstein’s relativity theory and Schrodinger’s equation in quantum mechan ...
CHEMISTRY FALL FINAL PRACTICE 2016
CHEMISTRY FALL FINAL PRACTICE 2016

... Write the nuclear notation for the most common isotope of chromium. ...
Define the Scientific Method
Define the Scientific Method

Double-Slit Experiment
Double-Slit Experiment

... Curved (accelerated) motion means that electron should do what? = ASSUMPTIONS BASED IN CLASSICAL PHYSICS!!! Quantum physics: ...
CHAPTER 2: ATOMS, IONS, AND COMPOUNDS
CHAPTER 2: ATOMS, IONS, AND COMPOUNDS

... Democritus (462-370 B.C.): proposed that all matter was made up of tiny, indivisible particles called atomos (meaning “not to cut) or atoms. Empedocles (490-430 B.C.): suggested all matter was composed of four basic elements: air, water, fire, and earth. Aristotle (384-321 B.C.): accepted Empedocles ...
Nuclear and Particle Physics
Nuclear and Particle Physics

chapter-27-1-with
chapter-27-1-with

... Light on Metal: Wave Predictions • Intensity of light is related to strength of electric field in the electromagnetic wave. – Increasing intensity means the light wave can apply a stronger force to the electron. – Increasing intensity means the kinetic energy of the ejected electrons will increase. ...
problem set #5 – s
problem set #5 – s

64-311/5: Atomic and Molecular Spectra
64-311/5: Atomic and Molecular Spectra

Lecture 1 - UW Canvas
Lecture 1 - UW Canvas

chapter 2 - Scranton Prep Biology
chapter 2 - Scranton Prep Biology

... of matter. Matter: Anything that takes up spaceand has mass. Mass : A measure of the amount of matter an obiect contains. You might want to distinguish between mass and weight for your students. Mass is the measure of the amount of matter an object contains, and it stays the same regardless of _chan ...
Set #4
Set #4

... 4. A long time ago, in a galaxy far, far away, electric charge had not yet been invented, and atoms were held together by gravitational forces. Compute the Bohr radius and the n=2 to n = 1 transition energy in a gravitationally hound hydrogen atom. (Krane, P33, pg. 204) 5. The fine structure constan ...
Chemical Reactions
Chemical Reactions

PWE 19-2: Measuring Isotopes with a Mass Spectrometer
PWE 19-2: Measuring Isotopes with a Mass Spectrometer

Chapter 27
Chapter 27

... His model includes both classical and non-classical ideas His model included an attempt to explain why the atom was stable ...
Electrons in Atoms
Electrons in Atoms

...  But it isn’t like this! The reality is much more complex!  The behaviour of electrons in atoms can be derived and described using quantum mechanics (QM).  At this stage we are not going to be concerned with the mathematical aspects of QM, but we will study in detail the results and concepts yiel ...
Slide 1
Slide 1

... • Quantum Theory – describes mathematically the wave properties of electrons and other very small ...
Frank-Hertz experiment with Neon
Frank-Hertz experiment with Neon

... frequency as the orbit got smaller and faster. This would produce electromagnetic radiation with continuous spectrum. However, late 19th century experiments with electric discharges through various low-pressure gasses in evacuated glass tubes had shown that atoms will only emit light (that is, elect ...
November 18
November 18

... Given that red light has a wavelength of 700 x 10-9 meters, what is the frequency and how much energy does it have? To find frequency, use first formula, c=lambda x frequency Frequency = 3x 108 m/s / 700 x 10-9 meters = 4.29 x 1014 Hz To find Energy, plug it into the second formula: E = hf = (6.6 x ...
HL Chemistry: Notes Atomic Theory
HL Chemistry: Notes Atomic Theory

Details
Details

... General Chemistry (CHM 111): MD (CHM 111), Phar (PH xxx) , (Dent Den xxx) Proposed by Dr. Badereldeen (Revised 2012) Week ...
Example 27-1
Example 27-1

... Bohr Model of the Atom •Niels Bohr was a Danish physicist who studied at the Rutherford lab. He decided to try to add the quantum effects of Planck and Einstein to the Rutherford planetary model of the atom ...
Chem I Review Part 1
Chem I Review Part 1

... C. its temperature, T D. its mass, m E. its atomic number, Z 22. Which of these scientists developed the nuclear model of the atom? A. John Dalton B. Robert Millikan C. J. J. Thomson D. Henry Moseley E. Ernest Rutherford 23. Rutherford's experiment with alpha particle scattering by gold foil establi ...
Arrangement of Electrons in Atoms
Arrangement of Electrons in Atoms

... velocity of an electron (or any other particle) x – represents position p – represents momentum (velocity multiplied by mass)  - represents a constant Δ – in this case, delta represents the uncertainty. ...
< 1 ... 725 726 727 728 729 730 731 732 733 ... 788 >

Atomic theory



In chemistry and physics, atomic theory is a scientific theory of the nature of matter, which states that matter is composed of discrete units called atoms. It began as a philosophical concept in ancient Greece and entered the scientific mainstream in the early 19th century when discoveries in the field of chemistry showed that matter did indeed behave as if it were made up of atoms.The word atom comes from the Ancient Greek adjective atomos, meaning ""uncuttable"". 19th century chemists began using the term in connection with the growing number of irreducible chemical elements. While seemingly apropos, around the turn of the 20th century, through various experiments with electromagnetism and radioactivity, physicists discovered that the so-called ""uncuttable atom"" was actually a conglomerate of various subatomic particles (chiefly, electrons, protons and neutrons) which can exist separately from each other. In fact, in certain extreme environments, such as neutron stars, extreme temperature and pressure prevents atoms from existing at all. Since atoms were found to be divisible, physicists later invented the term ""elementary particles"" to describe the ""uncuttable"", though not indestructible, parts of an atom. The field of science which studies subatomic particles is particle physics, and it is in this field that physicists hope to discover the true fundamental nature of matter.
  • studyres.com © 2025
  • DMCA
  • Privacy
  • Terms
  • Report