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Periodic Table Trends Pages 30-41 Practice problems page 41, #1-7 Review Lewis diagrams for the first ten elements of the periodic table. What Periodic Table patterns can be observed using these diagrams? Atomic Radius Graph What patterns can you see? What causes these patterns? Trend: Atomic Radius Atomic radius refers to the distance from ______________________________ ______________________________ Trend: Atomic Radius ATOMIC RADIUS DECREASES ACROSS PERIODIC TABLE ATOMIC RADIUS INCREASES DOWN PERIODIC TABLE Trend: Atomic Radius 1. Why does atomic radius increase as you move down a group? 2. Why does atomic radius decrease as you move across a period? Trend: Atomic Radius Trend: Atomic Radius Thought Activity: What happens to atomic radii if an atom loses or gains an electron? Trend: Ionization Energy Ionization energy refers to the amount of energy required to ___________ ______________________________ This trend refers to the first ionization energy Trend: Ionization Energy IE INCREASES ACROSS THE PERIODIC TABLE IE DECREASES DOWN THE PERIODIC TABLE Trend: Ionization Energy 1. Why does IE decrease as you move down a group? 2. Why does IE increase as you move across a period? Trend: Ionization Energy Trend: Electron Affinity Electron affinity refers to the change in energy after _______________ _______________________________ Another way to think of it is how much an atom wants another electron Trend: Electron Affinity An atom that becomes more stable prefers having an extra electron. [high electron affinity] An atom that becomes less stable does not prefer having an extra electron. [low electron affinity] Trend: Electron Affinity EA INCREASES ACROSS THE PERIODIC TABLE EA DECREASES DOWN THE PERIODIC TABLE Trend: Electron Affinity 1. Why does EA decrease as you move down a group? 2. Why does EA increase as you move across a period? Trend: Electron Affinity Trend: Chemical Reactivity Alkali Metals Video Trend: Chemical Reactivity Alkali metals increase reactivity down the Periodic Table. Halogens increase reactivity up the Periodic Table.
