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ÀüÀÚȸ·Îpearson : Floyd ÀüÀÚȸ·Î 9ÆÇ ¼Ö·ç¼Ç Pearson ¿¹Á¦°ü·Ã¹®Á¦

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ANSWERS
Section 1?1

Chapter 1

SECTION CHECKUPS
The Atom 1. The Bohr model has a central nucleus consisting of protons and neutrons orbited by electrons at varying distances from the nucleus. 2. An electron is the smallest particle of negative electrical charge. 3. Protons and neutrons. A proton is a particle of positive charge and a neutron has no net charge. 4. The atomic number is the number of electrons in the nucleus of an atom. 5. An electron shell contains orbiting electrons at a certain energy level. Each shell of a given atom is at a different energy level. 6. A valence electron is one that is in the outer shell of an atom. 7. A free electron is a valence electron that has broken free of its parent atom. 8. A positive ion is a previously neutral atom that has lost a valence electron and has a net positive charge. A negative ion is one that has gained an extra electron and has a net negative charge. 9. The quantum model is based on the uncertainty



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