It used this threat of "massive retaliation" as a means to deter Soviet aggression. By the late s, the Soviet Union had built up a convincing nuclear arsenal that could be delivered on the territory of the United States and Western Europe. By the mids, unilateral deterrence gave way to "mutual deterrence," a situation of strategic stalemate.
Using a CRT he observed that nearby chemicals glowed. Further experiments found very penetrating rays coming from the CRT that were not deflected by a magnetic field. He named them "X-rays".
Hear Thompson talk about the size of an atom. Examine Thompson's 3 experiments to verify atoms had parts.
She and her husband Pierre also discovered the radioactive elements polonium and radium. Marie was the first person awarded two Nobel prizes. He established that the nucleus was: He also assumed that the electrons were located outside the nucleus. Moseley Using x-ray tubes, determined the charges on the nuclei of most atoms.
He wrote"The atomic number of an element is equal to the number of protons in the nucleus". This work was used to reorganize the periodic table based upon atomic number instead of atomic mass. His atomic model had atoms built up of sucessive orbital shells of electrons.
Proposed Principle of Indeterminancy - you can not know both the position and velocity of a particle. Thus was discovered the neutron. This process ejects more neutrons continuing the fission chain reaction.First, go to The Tough Guide to the Known Galaxy and read the entry "FUTURE HISTORY".
The read the TV Trope's Standard Sci-Fi History (you might also want to read the TV Trope's Standard Sci-Fi kaja-net.comyed, formulaic, derivative, and space opera; but very common).
Also check out this website's historical timeline of (mostly) real world events.. The 's flavored future history below is.
The idea of the atom — at one time a theory, but now directly observable — is the basic concept that unites all aspects of Chemistry, so this is where we begin. Chemistry Connections: Atomic Theory, Equilibrium, History/Biography, Nuclear, Organic/Biochemistry Description: Discusses methods used to authenticate antiquities, focusing on radiocarbon dating. The process and the background science are described. Atomic Structure Timeline ~ updated Sept ~ Welcome to the atomic structure timeline. This site explores discoveries related to atomic structure including the electron, proton and neutron.
Atomic theory: Atomic theory, ancient philosophical speculation that all things can be accounted for by innumerable combinations of hard, small, indivisible particles (called atoms) of various sizes but of the same basic material; or the modern scientific theory of matter according to which the chemical elements.
Historical development of theories and models of atomic structure summarised for chemistry students.
I made this website for an extra credit chemistry project on the history of the atomic theory. Hopefully you can learn a thing or too from it.
Happy learning! HISTORICAL OUTLINE of the Atomic Theory and the Structure of the Atom. Development of the Atomic Theory. Democritus ( BC) First proposed the existence of an ultimate particle. Used the word "atomos" to describe this particle.
Democritus. Aristotle ( BC) was a proponent of the continuum. Summary of the Historical Development of Modern Theory of Atomic Structure The table below summarises the contribution of a number of Scientists to the development of a model of the atom including the evidence they used to support the model.