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Continuing the Atomic Theory

Continuing the Atomic Theory. Bohr Model (1913). electrons move in definite orbits around the nucleus these orbits or energy levels are located at certain distances from the nucleus . Bohr’s Model. nucleus. Electrons. Neils Bohr. Wave Model (present day). based on complex math equations

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Continuing the Atomic Theory

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  1. Continuing the Atomic Theory

  2. Bohr Model (1913) • electrons move in definite orbits around the nucleus • these orbits or energy levels are located at certain distances from the nucleus

  3. Bohr’s Model nucleus Electrons

  4. Neils Bohr

  5. Wave Model (present day) • based on complex math equations • orbits are more complex than originally thought • de Broglie stated that electrons (particles) have wave properties, and he viewed these as standing waves, like those produce when a guitar string is plucked (classical physics.) • Schrodinger assumed that the electron in Hydrogen behaves as a standing wave.

  6. Wave Model (continued) • When Schrodinger’s equation is analyzed, many solutions are found. • Each solution represents an atomic orbital. • An atomic orbital is the most probable location for finding an electron.

  7. What is an orbital? • It is not a Bohr orbit (not moving in a circular path.) • How is the electron moving? • We don’t know! • There is a fundamental limitation to just how precisely we can know both the position and momentum of a particle at a given time

  8. This is kind of how we assume an electron travels e-

  9. Heisenberg Uncertainty Principle • The more accurately we know the particle’s position, the less accurately we can know it momentum and vice versa. • We can’t know the exact motion of the electron around the nucleus. • The area that an electron orbits is called an “electron cloud”

  10. Louis de Broglie Erwin Schrodinger

  11. Werner Heisenberg

  12. Subatomic Particles • subatomic-lower (or smaller) than an atom • Protons-positive particles • Neutrons-neutral particles • Electrons-negative particles

  13. Location of particles • Protons and neutrons are in the nucleus (core) of the atom. • electrons are buzzing around the nucleus in the electron cloud or shell. • The nucleus makes up 99.99% of the mass of the atom. • You compared to pocket lint • The nucleus is 1/100,000 of the volume of an atom • a marble compared to a football stadium

  14. Mass of particles • Since subatomic particles are so small they cannot be measured in grams • instead they are measured in atomic mass units or amu • 1 amu = 1.61x10-24 g • remember 1 g is about the mass of a paper clip

  15. Table of particles

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