Period: 1. Name the three particles of the atom and their respective charges are: a. b. c. 2. The number of protons in one atom of an element determines the atom’s ‚ and the number of electrons determines of an element. 3. The atomic number tells you the number of in one atom of an element. It also tells you the number of in a neutral atom of that element. The atomic number gives the “identity “ of an element
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poor conductor of electricity. If the electrons in an atom can’t be moved from their orbits at all‚ the material is an insulator. If at least some of the electrons can be moved‚ the material is a resistor. Two of the best-known conductors of electricity are silver and copper. The atomic structures of the silver and copper atom are compared in Figure 6. Note that both atoms have only one electron in the outermost orbit. This makes silver and copper excellent conductors of electricity. Silver
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like sodium chloride and water play important roles in living things‚ most compounds found in organisms are more complex‚ containing at least three or four elements. Concept 4.2 Chemical properties are based on the structure of atoms. Different elements have different properties. Some are solid metal at room temperature‚ some are invisible gases‚ some elements readily react with other elements‚ whiles others hardly react at all. These properties affect the roles that
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has been credited with most of them. His major contributions to science is his atomic theory‚which was the basis on which modern atomic theory was developed.(http://www.iep.utm.edu/democrit/) Democritus was the first man to suggest the existence of atoms and in suggesting their existence he also defined their possible characteristics. “He reasoned that if the stone were to be continually cut into smaller
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electron pairs between two atoms. Translation: -Ionic bonding happens between a metal and a non-metal (east coast and west coast) -One atom completely donates its valence electrons to another atom -Metals become CATIONS (positive charge/oxidation state); Non-metals become ANIONS (negative charge/oxidation state) Example: Na + Cl → Na+Cl- or Mg + O → Mg2+O2- -In covalent bonding one atom completely shares its valence electrons with another atom (west coast and west coast)
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correct answer is: electrons. Question 2 of 20 The structural unit that retains the properties of an element is the molecule. atom. cell. electron. 5 out of 5 Correct!! Question 3 of 20 Which of the following are found in the nucleus of an atom? Protons Neutrons Electrons A and B 0 out of 5 The correct answer is: A and B Question 4 of 20 The component of an atom or molecule that is most important in determining its chemical properties is the isotope. neutron. electron. proton. 0
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Ancient Greece Greece The Greek peninsula has been culturally linked with the Aegean Islands‚ and the west coast of Asia Minor since the Neolithic Age. The numerous natural harbors and close-lying islands lead to a unified‚ maritime civilization. However cultural unity did not produce political unity. Mountain ranges and deep valleys separated the peninsula into small economic and political units. Constant feuding between cities and surrounding empires for political power made Greece the sight
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Hollidaysburg‚ PA: Parent Child Press‚ 2008. Print. Lillard‚ Paula Polk. Montessori Today: a comprehensive approach to education from birth to adulthood. New York: Schocken Books‚ 1996. Print. "Greek Geometry - Euclid‚ Pythagoras‚ Archimedes and Thales." explorable.com - Immunizing Against Nonsense - Better Brains for Science. N.p.‚ n.d. Web. 14 Mar. 2013. . "greek geometry." Jim Wilson ’s Home Page. N.p.‚ n.d. Web. 14 Mar. 2013. .
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Persian rule was very influential in the fields of art and education. It was in this time when Babylon experienced the development of mathematics‚ cosmology‚ and astronomy‚ subjects that were highly regarded. It is also said that Thales and Pythagoras had studied‚ lived‚ and developed their ideas in Babylon during Persian rule (Mark‚ “Babylon”). However‚ the Persian rules abruptly ended with the conquest of Alexander the Great‚ who viewed the city with reverence‚ hereby ordering
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CaN2O6 Find the number of atoms in 7.6 g of sodium phosphide. 7.6 g x 1 mol x 6.02 x 1023 molecules x 4 atoms Na3P = 1.8 x 1023 atoms 99.94 g 1 mol 1 molecules How many C atoms in 60.5 g of sucrose? C12H22O11 molar mass = 342.34 g/mol 60.5g x 1 mol x 6.02 x 1023 molecules x 12 atoms C = 1.28 x 1024 atoms 342.34 g 1 mol 1 molecules If 3.75 x 1024 atoms of hydrogen are found
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