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Unformatted text preview: John Dalton’s Model, what was later proven wrong and why. • Know people and discoveries associated with the discovery of protons, neutrons, electrons. • Know Plum‐Pudding Model vs Nuclear Model. CHEM121 Exam 1 Study Guide F2012 page 2 of 4 Chapter 4 (Continued) • now Rutherford’s Alpha‐Scattering K
Experiment and what was determined from it (atomic nucleus, atom mostly empty space, the size of an atom relative to its nucleus). • ubatomic particles S – proton (p+): +1 charge, inside nucleus – neutron (n): neutral, inside nucleus – electron (e–): –1 charge, outside nucleus • Electrostatic force: force resulting from a charge on particles ‐ Objects w/ like charges repel one another. ‐ Objects w/ unlike charges attract each other. • now the names and element symbols for K
elements #1‐20 on the Periodic Table. – Given the element symbol, name the element, or vice versa. Spelling counts! • now definitions of isotope, atomic mass K • Atomic notation: mass number = A
atomic number = Z E = element symbol mass # (A): # of protons + # of neutrons • Use the Periodic Table to identify the most abundant isotope of any element given its naturally occurring isotopes. • Use the Periodic Table to identify those elements whose naturally occurring isotopes are all radioactive and unstable. The Periodic Table column = group, family row = period, series Representative Elements: A Group Elements Group IA: alkali metals (except H) Group IIA: alkaline earth metals Group VIIA: halogens Group VIIIA: noble gases Transition Metals/Elements: B Group Elements Inner Transition Elements: ‐ Elements in lanthanide and actinide series • Metals, nonmetals, and semimetals: ‐ Know properties...
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