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Concept 1. Structure of the Atom Questions and Answers 2024
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Concept 1. Structure of the Atom
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Concept 1. Structure of the AtomAtom - answer The smallest particle of an element that still has the properties of that
element.
Proton - answer(p+) Positive particle in the nucleus.
Neutron - answer(n0) Neutral particle in the nucleus with protons.
Electron - answer(e-) Negative particle outside of the nucleus in the electron cloud.
Quarks - answer The smallest known particles.
Valence electrons - answer Electrons in the outermost energy level.
Draw a timeline of the discovery of the structure of the atom. Include date, name, and a
brief summary of each discovery or model. - answer1. 400 B.C, Democritus, first to
name the atom.
2. 1803, John Dalton (solid sphere model), all atoms of an element are identical.
3. 1869, Dmitri Mendeleev, developed the first periodic table by atomic mass.
4. 1904, JJ Thompson (Plum pudding model), positively charged with particles.
5. 1911, Ernest Rutherford (Nuclear model), positive mass in the center and negative
particles surround.
6. 1913, Henry Moseley/Niels Bohr (Bohr model), electrons travel in fixed orbits.
7. 1926, Schrodinger and Heisenberg (Electron cloud model), electrons in shells in the
cloud and not fixed orbit.
Differentiate between the Bohr Model and the Electron Cloud Model. - answerThe Bohr
Model suggests that the electrons travel in fixed orbits around the nucleus, while the
Electron Cloud Model suggests that the nucleus is surrounded by an electron cloud, but
doesn't travel in fixed orbits.
Summarize our current understanding of atomic structure. Include the two parts, where
the three particles are located, and where the mass and volume in an atom mainly exist.
- answer2 parts: Nucleus and electron cloud.
3 particles: Protons, neutrons, and electrons.
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