BSC 1010 Chapter Notes - Chapter 2: Radiant Energy, Bohr Model, Unified Atomic Mass Unit
29 Jan 2017
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Chapter 2: the nature of molecules and the properties of water. Atomic structure includes a central nucleus and orbiting electrons. Physicist niel bohr proposed that every atom possess an orbiting cloud of electrons. Protons and neutrons in center: protons and neutrons are held together by force that works only over short distances. Chemical behavior of an atom is due to the number and configuration of electrons. It takes 6. 02 x 1023 to make 1 gram: protons weigh 1. 007 daltons, neutrons weigh 1. 009 daltons, electrons weigh (cid:2869)(cid:2869)84(cid:2868) of a daltons. Electrons have positive charges and are counterbalanced by negatively charged electrons. Located in orbits by their attraction to the positively charged nucleus. Cation: more protons than electrons and has a net charge. Anions: more protons than electrons, but has a negative charge. All atoms of an element have the same number of protons, may not have same number of neutrons (isotope)
