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Introduction to Atom

What is a proton? a positively charged particle.
Who was democritus? He believed an atom was a single hard particle.
WHo was aristotle? He thought all things were compsed of: air; earth; water; and fire.
What is an atom? The smallest unit of an element that maintais the properties of the element.
Who is John Dalton? All substances are made of atoms.
Who was Joseph Thomson? He proved the existance of negatively charged particles inside the atom.
Who was Ernest Rutherford? Proved atoms are mostly space and the nucleus is very dense and has a postive electical charge.
Who was Bohr? He proposed that electrons moved around an atom in a certain path or energy level.
Who were SHrodinger and Heisenberg? The exact path of an electron is unpredictable.
What is the electron cloud? The regions where electrons are most likely to be found.
What is the nucleus? The central part of the atom which contains protons, atomic mass, neutrons, and a mass number.
What is the atomic number? The number of protons in the nucleus.
What is a neutron? small particles with no electrical charge.
What is an electron? Negatively charged particles found outside of the atom in the electron cloud.
What is an ion? an electrically charged atom or group of atoms.
What is an isotope? Atoms of an element w/ the same # of protons but whose neuton # differs.
How does the the Gravitational force apply to atoms? B/c atoms are so small the gravitational force is small.
What is the Electromagnetic Force? Opposites arrtact. Same charges repel.
What is the strong force? Prevents repulsion of protons in the nucleus.
What is the weak force? A neutron can trun into a proton and an electron.
Created by: gymnastgal23