Flashcards
[SCIENCE] chem - models for the atom
Cards in this deck (24)
- 1spherical model (discoverer)Leucippus and Democritus
- 2spherical model (def)the continued division of matter would eventually yield indivisible particles
- 3atom acc to spherical model- indivisible particles
- solid and spherical - 4theory of john dalton- atoms cannot be created nor destroyed but they combine to form complex structures
- each element is made up of their own type of atoms that have distinct weights - 5what model did john dalton adoptspherical model
(john dalton) - 6plum pudding model (discoverer)Joseph John Thomson
- 7plum pudding model (def)- cathode rays are composed of negatively charged particles which are much smaller than the atom
- atom is not indivisible but is a spherical sea of positive charge with embedded negatively-charged corpuscles called electrons - 8electrons acc to plum pudding modelembedded negatively-charged corpuscles
- 9experiment under nuclear modelgold foil experiment
- 10gold foil experiment (who conducted)Ernest Rutherford
- 11gold foil experiment (def)- bombarded a thin gold foil with alpha particles (which are positively charged)
- results showed that alpha particles passed through most of the atom, but a few were heavily deflected - 12theory of ernest rutherford- atom is mostly open space with most of its mass concentrated in a small positively charged nucleus
- the lighter electrons surround this nucleus
- atoms of different elements have different positive charges - 13who discovered protonsEugen Goldstein
- 14positively charged particlesprotons
- 15who discovered neutronsJames Chadwick
- 16neutral particlesneutrons
- 17what hold protons togetherneutrons
- 18planetary model (discoverer)Niels Bohr
- 19planetary model (def)- electrons can be found around the nucleus only along particular orbits with a specific energy level
- resembles planets of the solar system that have distinct orbits - 20quantum mechanical model (discoverer)> Louie de Broglie
> Erwin Schrödinger
> Werner Heisenberg - 21quantum mechanical model (Louie de Broglie: def)subatomic particles such as electrons exhibit wave-like behavior
- 22quantum mechanical model (Erwin Schrödinger: def)- he mathematically modeled electrons as waves
- was able to predict phenomena that cannot be explained by Bohr’s model - 23quantum mechanical model (Werner Heisenberg: def)- it is mathematically impossible to know the position and momentum of an electron at the same time
- the model does not show the exact position of electrons but the regions
where electrons are most likely to be found (atomic orbitals) - 24atomic orbitals acc to quantum mechanical modelregions where electrons are most likely to be found
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- Review Mentorsplus Flashcards on [SCIENCE] chem - models for the atom, created by Hannah Rabano on 15/07/2022.
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- Created by Hannah Rabano · Jul 15, 2022
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