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Utilizing theperiodictable cheat sheet
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Timothy Welsh
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San Joaquin County Office of Education
Dec. 23, 2013

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2,077 views
Utilizing theperiodictable cheat sheet
Dec. 23, 2013

0 likes

2,077 views
Timothy Welsh
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San Joaquin County Office of Education
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Utilizing theperiodictable cheat sheet
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Utilizing theperiodictable cheat sheet
AP Chemistry –
Core Concept Cheat Sheet 13: Utilizing The Periodic Table Key Chemistry Terms • • • • • • • • • • • • • Periodicity, Atomic Mass & Atomic Radii Periodic Table: Tool for organizing the elements. Periods: Rows on the periodic table. Groups: Columns on the periodic table. Periodicity: Predictable patterns and trends on the periodic table. Atomic Number: Number of protons in an atom. Defines the element. Periodic table is organized in increasing order of atomic number. Atomic Mass: mass in grams of 1 mole of atoms (6.02 x 1023 atoms). Atomic Radius: Half the distance between two nuclei of the same element when bonded together. Electronegativity: Pull an atom has on the shared electrons in a bond with another atom. Ionization Energy: Energy required to remove the outermost electron from an atom. Electron Affinity: Energy released when another electron is added to an atom. Ion: Atom with a charge. Cation: Positively charged ion. Results from loss of electrons. Anion: Negatively charged ion. Results from gain of electrons. Reading the Periodic Table Most periodic tables give the following information (although it may be in a different order): Atomic # 12 Symbol C Name Carbon Atomic Mass 12.01 ↓ a group: # of protons and electrons increase, but the electrons are added in a new electron shell. The new electrons are “shielded” by the inner electrons from the pull of the nucleus. Radii increases. Relationship Between Radii and Other Properties a period: As radii decreases: The electrons are closer to the nucleus and therefore feel the “pull” more strongly. Electronegativity, ionization energy and electron affinity increase. Radii when forming a cation: Loss of electrons. There are now more protons than electrons. The pull of the protons on each electron is greater. Cations have smaller radii than their parent atom. 6 7 Metals Non-metals Atomic Radii a period: # of protons and electrons increase, increasing the “pull” between the nucleus and the electrons. Radii decreases. Ionic Radii 4 5 3 ↓ a group: Subatomic particles are also being added. This causes mass to increase. ↓ a group: As radii increase: The electrons are farther from the nucleus and therefore are more “shielded” by inner electrons from the pull of the nucleus. Electronegativity, ionization energy and electron affinity decrease. Important Regions of the Periodic Table: 1 2 Atomic Mass a period: Subatomic particles are being added. This causes atomic mass to increase. Radii when forming an anion: Gain of electrons. There are fewer protons than electrons. The pull of the protons on each electron is less. Anions have larger radii than their parent atom. Metalloids 1. Alkali Metals 2. Alkaline Earth Metals 3. Transition Metals 4. Halogens 5. Nobel Gases 6. Lanthanides 7. Actinides 8 tall columns = main groups or representative elements Examples List Li, Cs and K in Order of Increasing: Radii: Li < K < Cs (radii increases ↓ a group) Electronegativity: Cs < K < Li (decreases as radii increases) Ionization Energy: Cs < K < Li (decreases as radii increases) Electron Affinity: Cs < K < Li (decreases as radii increases) Memorizing the First 20 Elements Use a Mnemonic to remember the symbols of the first 20 elements in order: List Ca+2, Ca and Ca1+ in order of increasing radii: Ca2+ < Ca1+ < Ca (Each time an electron is lost, a charge of +1 is added. As electrons are lost, there is a higher ratio of protons : electrons and radii decreases) Happy Henry, the Little Beach Boy, CaN dO FiNe; Naughty Megan, the Alpine Sister, Pretends to Ski at ClArK Canyon. How to Use This Cheat Sheet: These are the keys related this topic. Try to read through it carefully twice then rewrite it out on a blank sheet of paper. Review it again before the exams. RapidLearningCenter.com ©Rapid Learning Inc. All Rights Reserved

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