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Chapter 2 Lesson 2 - Atoms and Molecules pp.38-40

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Date Shared: 8 September 2013

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What are two common examples of compounds? water and table salt (p.38) What are atoms composed of? subatomic particles (p.39) Who pioneered quantum physics? Max Planck (p.39) Some matter has only one kind of what? atom (p.38) What does an atom consist of? a positive nucleus surrounded by a negatively charged cloud of electrons (p.39) What is a compound? A substance that is formed when atoms of two or more elements join together (p.38) How many elements occur naturally? 92 (p.38) Who is constantly searching for smaller subatomic particles? physicists (p.39) What elements are in salt? sodium (Na), chlorine (cl) (p.38) What kind of charge do protons have? positive (p.39) What do the following 3 elements stand for? C (carbon), O (oxygen), Ca (calcium) (p.38) What can harm molecules in cells? radon gas (p.40) How many elements are essential to living things? 25 (p.38) What orbits the nucleus of an atom? electrons (p.39) What are radioactive isotopes called? radioisotopes (p.40) What is too small to be seen in an atom? subatomic particles (p.39) What element is added to table salt? iodine (p.38) What two people use radioisotopes to trace the pathway of elements? biologists and doctors (p.40) What 4 elements make up 96.3 percent of a person's weight? oxygen, carbon, hydrogen, nitrogen (p.38) What elements are found in DNA? carbon, nitrogen, oxygen, hydrogen, phosphorus (p.38)

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8 September 2013

srhereford Author Country Flag United States of America

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