Question

topic iii: the atom - vocabulary review
term description/definition represent with a picture/graphic or formula

1. democritus
2. aristotle
3. compare democritus and dalton theories
4. j.j. thomson.
5. ernest rutherford and the foil experiment.
6. r. a. millikan (who is and discovery)
7. james chadwick (who is and discovery)
8. niels bohr
9. atom

Explanation:

1. Democritus: Ancient Greek philosopher who proposed atoms as indivisible particles. No simple formula, can be represented by a simple drawing of tiny, indivisible spheres.
2. Aristotle: Rejected the atomic theory, believed in earth, air, fire and water elements. Can be represented by symbols of these four elements.
3. Democritus proposed atoms as fundamental, indestructible units; Dalton's atomic theory added that atoms of same - element are identical and combine in fixed ratios. Can be represented by comparing simple diagrams of their ideas.
4. J.J. Thomson: Discovered the electron, proposed the plum - pudding model of the atom. Represented by a diagram of a positive sphere with electrons embedded.
5. Ernest Rutherford: His foil experiment led to the nuclear model of the atom. Represented by a diagram showing alpha - particles being deflected by a small, dense nucleus.
6. R.A. Millikan: Determined the charge of an electron through the oil - drop experiment. Represented by a diagram of the oil - drop apparatus.
7. James Chadwick: Discovered the neutron. Represented by a simple symbol for the neutron.
8. Niels Bohr: Proposed a model of the atom with electrons in quantized orbits. Represented by a diagram of concentric circles (orbits) with electrons on them.
9. Atom: The basic unit of matter, composed of protons, neutrons and electrons. Represented by a simple diagram showing a nucleus with protons and neutrons and electrons in orbits.

Answer:

1. Description/definition: Ancient Greek philosopher who thought matter was made of indivisible particles called atoms. Represent with a picture/graphic or formula: Simple drawing of tiny, indivisible spheres.
2. Description/definition: Rejected atomic theory, believed in earth, air, fire, water elements. Represent with a picture/graphic or formula: Symbols of earth, air, fire, water.
3. Description/definition: Democritus proposed fundamental, indestructible atoms; Dalton added that atoms of same element are identical and combine in fixed ratios. Represent with a picture/graphic or formula: Compare simple diagrams of their ideas.
4. Description/definition: Discovered the electron, proposed plum - pudding model. Represent with a picture/graphic or formula: Diagram of positive sphere with electrons embedded.
5. Description/definition: Foil experiment led to nuclear model of atom. Represent with a picture/graphic or formula: Diagram of alpha - particles deflected by nucleus.
6. Description/definition: Determined electron charge via oil - drop experiment. Represent with a picture/graphic or formula: Diagram of oil - drop apparatus.
7. Description/definition: Discovered the neutron. Represent with a picture/graphic or formula: Symbol for the neutron.
8. Description/definition: Proposed atom model with electrons in quantized orbits. Represent with a picture/graphic or formula: Diagram of concentric circles (orbits) with electrons.
9. Description/definition: Basic unit of matter with protons, neutrons, electrons. Represent with a picture/graphic or formula: Diagram showing nucleus with protons/neutrons and electrons in orbits.