Chemistry 111 finishing chapter 2 notes
Chemistry 111 finishing chapter 2 notes CHEM 111 003
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CHEM 111 003
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This 1 page Class Notes was uploaded by Jamisha Evans on Friday September 9, 2016. The Class Notes belongs to CHEM 111 003 at Eastern Kentucky University taught by Dr. James Patton in Fall 2016. Since its upload, it has received 5 views. For similar materials see General Chemistry 1 in Chemistry at Eastern Kentucky University.
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Date Created: 09/09/16
Chemistry 111 Lecture Notes 2.3- Atomic number, mass number, and isotopes Isotopes Atoms of the same element but differ in the number of neutrons Share similar chemical properties Useful in decay measurements and isotopic labeling Subatomic particles (most importantly protons) differentiates one atom of a particular element to that of another element. Atomic number (Z) Number of protons in nucleus of atom All atoms of the same element have the same number of protons Listed on periodic table EXAMPLE: Beryllium (Be) atomic number on the periodic table is 4 so it has 4 protons. Mass number (A) Number of protons + number neutrons in the nucleus How to find number of neutrons Mass number –atomic number EXAMPLE: Carbon has a mass number of 14 Find # of protons- 6 (look at atomic # of periodic table) Find # of neutrons- 8 (mass # - #of protons/atomic number) Find # of electrons- 6 (same as # of protons) 2.4- The periodic table Contains periods and groups/families (vertical columns) Elements having similar chemical and physical properties are grouped together Lists elements to increasing atomic number 1A-8A-: Main group or representative elements 1B-8B: Transition metals Can be organized in aboard way; metals, non-metals, and metalloids Metals: good conductor of heat and electricity; ductile; malleable; found on left side of periodic table Non-metals- poor conductor of heat and electricity but good insulators; found on right side of periodic table Metalloids-share properties intermediate between metals and metalloids; found bordering metals and nonmetals Need to know Alkali metal (Group 1A) Alkali Eaarth metals( group 2A) Halogens(group 7A) Noble gases(Group8)
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