1) The outermost electrons in an atom are a) cloud electrons b) orbital electrons c) far electrons d) valence electrons 2) Who is credited with first suggesting the idea of an atom (atomos) a) Dalton b) Thomson c) Democritus d) Schrodinger 3) His theory said all matter is made up of atoms and that an atom cannot be divided into smaller parts. a) Democritus b) Dalton c) Thomson d) Rutherford 4) Cathode ray tube experiment a) Democritus b) Newton c) Dalton d) Thomson 5) Plum pudding model a) Thomson b) Dalton c) Newton d) Rutherford 6) Gold foil experiment a) Dalton b) Newton c) Rutherford d) Einstein 7) Planetary Model of the Atom a) Bohr b) Dalton c) Rutherford d) Clinton 8) Electron Cloud Model a) Newton b) Einstein c) Bohr d) Schrodinger 9) Modern atomic theory states that the atom is a diffuse cloud of ____ surrounding a small, dense nucleus. a) electrons b) neutrons c) protons d) quarks 10) In the Bohr model of the atom, the electrons move in fixed, __________ paths around a dense, positively-charged nucleus. On the other hand, the quantum mechanical model shows the probability of finding an electron as a __________ of negative charge. a) circular; cloud b) horizontal; cloud c) circular; beam d) even; photon

Atomic history

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