• 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
Subatomic Physics: the Notes - McMaster Physics and Astronomy
Subatomic Physics: the Notes - McMaster Physics and Astronomy

... Over time it became clear that there are actually three different types of radioactive rays, called α, β and γ rays. Each responds differently to a magnetic field, with α rays behaving like positively charged particles, β rays behaving like negatively charged particles and γ rays behaving like elect ...
BTEC National in Applied Science Unit 01 Sample redacted web
BTEC National in Applied Science Unit 01 Sample redacted web

Physikalische Chemie
Physikalische Chemie

Organic Naming Notes
Organic Naming Notes

... Organic Chemistry Organic chemistry is the study of carbon based compounds - This field of chemistry is very important because all living things and many non-living material are organic 1-meth, 2-eth, 3-prop, 4-but, 5-pent, 6-hex, 7-hept, 8-oct, 9-non, 10-dec ...
Power is the rate at which work is done or is the amount energy
Power is the rate at which work is done or is the amount energy

Unit 6: Reactions and Stoichiometry
Unit 6: Reactions and Stoichiometry

Chapter 6 Chemical reactions Classification And Mass Relationships
Chapter 6 Chemical reactions Classification And Mass Relationships

... get equal numbers by taking equal weights. For example since one grape weighs less than one cabbage, one pound of each will have different numbers. • The same is true for atoms or molecules of different substances. Equal numbers hydrogen and glucose molecules always have a mass ratio equal to the ra ...
Slide 1
Slide 1

... Q18 If two charges are both doubled in magnitude without changing the distance between them, will the force that one charge exerts on the other also be doubled? The force varies as q1q2/r2 so the force will increase by a factor of 4 ...
Molecular Compound
Molecular Compound

... • Exceptions to the octet rule include those for atoms that cannot fit eight electrons, and for those that can fit more than eight electrons, into their outermost orbital • Hydrogen forms bonds in which it is surrounded by only two electrons • Boron has just three valence electrons, so it tends to f ...
Cold Electron Quantum Mechanical Model for Superconductivity
Cold Electron Quantum Mechanical Model for Superconductivity

b) a - Purdue Physics
b) a - Purdue Physics

... then the charge in the conductor will separate. If I now touch the conductor where there is excess electrons they will repel the electrons on the skin and electrons will flow into me. If I now remove my finger the original conductor will be positively charged. If I had touched the conductor where th ...
8.1: Linear Momentum and Force By: Chris, Jakub, Luis
8.1: Linear Momentum and Force By: Chris, Jakub, Luis

... 1. An object that has a small mass and an object that has a large mass have the same momentum. Which object has the largest kinetic energy? kinetic energy of an object is K = (1/2)mv2. Two objects of different mass are moving at the same speed; the more massive object will have the greatest momentum ...
lect 7
lect 7

... contained within atoms or molecules. Thus, electrons are only transferred between species. Redox, short for reduction-oxidation, is the termed used to denote the transfer of electrons. Oxidation and reduction are defined as: Reduction: The gain of electrons by a compound Oxidation: The loss of elect ...
Phase-field model of self-polarization and cell movement
Phase-field model of self-polarization and cell movement

... Due to the discrete nature of their electronic spectrum quantum dot structures are sometimes called semiconductor macro-atoms. In contrast to real atoms, however, in quantum dots electrons and holes are typically rather strongly coupled to the lattice degrees of freedom, i.e., to acoustic and optica ...
Notes
Notes

Chris, Jakub, Luis PDF
Chris, Jakub, Luis PDF

... Two objects of different mass are moving at the same speed; the more massive object will have the greatest momentum. For the momentums to be equal, the product of the velocities and masses of the 2 objects must be equal ...
Light and the Resolution of the Heisenberg Uncertainty Principle
Light and the Resolution of the Heisenberg Uncertainty Principle

... Briefly stated, the paradox at the heart of physics is the wave/particle dilemma. In breaking down the material structure of physical reality, it is believed that atoms are composed of discrete energy packets called quanta. This model works quite well in explaining many complex aspects of observed b ...
What`s New in Q-Chem - Q
What`s New in Q-Chem - Q

Honors Chemistry Semester 1 Exam Review
Honors Chemistry Semester 1 Exam Review

... 1. Differentiate between the significance of the coefficients in a balanced chemical equation and the significance of the subscripts in a chemical formula. _________________________________________________________________________________________________ ______________________________________________ ...
2014-15 FINAL REVIEW Nomenclature: Chemical Name Chemical
2014-15 FINAL REVIEW Nomenclature: Chemical Name Chemical

Effective Topological Field Theories in Condensed Matter Physics
Effective Topological Field Theories in Condensed Matter Physics

... In condensed matter physics, we ask what are the fundamental states of matter? In the classical world we have solid, liquid and gas. The same H2O molecules can condense into ice, water or vapor. In the quantum world we have metals, insulators, superconductors, magnets etc. Most of these states are d ...
Physics: Principles and Applications
Physics: Principles and Applications

... • X-rays have wavelengths of the order of 0.1 nm. Therefore we expect a grating with a periodicity of this magnitude to strongly diffract X-rays. • Crystals have such a spacing! Indeed they do diffract X-rays according to Bragg’s law ...
Physical Chemistry - Angelo Raymond Rossi
Physical Chemistry - Angelo Raymond Rossi

... • The factor dν provides the energy density observed in the frequency interval of width dν centered at frequency ν. The basis of the model is that the atomic nuclei and corresponding electrons act as ...
Alkali D Line Data
Alkali D Line Data

... f is the partial pressure of water vapor in the air, in Pa (which can be computed from the relative humidity via the Goff-Gratch equation [12]). This formula is appropriate for laboratory conditions and has an estimated (3σ) uncertainty of 3 × 10−8 from 350-650 nm. The lifetimes are weighted average ...
Infrared Spectroscopy and Mass Spectroscopy
Infrared Spectroscopy and Mass Spectroscopy

... Loss of 33, 35, 38 also unusual. However a loss of 15, 18, 31 is good evidence for a molecular ion. •Switch to CI, vary reagent gas. Positive, negative probes. Check for CI adduct ions. e.g. C2H5+ , CH5+, C3H5+ •Find MW by other method Other compounds present may give ions that deceive us. May be mo ...
< 1 ... 269 270 271 272 273 274 275 276 277 ... 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