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Lecture

Periodic Trends.docx

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Department
Chemistry
Course
CHEM 1A
Professor
Amanda Brindley
Semester
Fall

Description
Periodic Trends Atomic Radius Ionic Radius Ionization Energy ElectronAffinity What we are going to learn! Some history about the periodic table development Trends: using the periodic table to predict Ionization energy, electron affinity, atomic radius, effective nuclear charge and electro negativity. Instead of 1.21, directly, we’ll just talk about some interesting elements. Mendeleev Periodic Table Development of the Periodic Table Electronegativity Effective Nuclear Charge Electronegativity Effective Nuclear Charge Increases __________________ Left to right Vertical Trend doesn’t make a lot of sense to discuss here so we will ignore it Nuclear charge felt by an electron when both the actual _____________________and the _______________ Nuclear charge Shielding effects of other electrons are taken into account. Core electrons shield the ______________. Valence electrons Reason behind many of the other trends! More protons makes more nuclear charge Atomic Radius Increases down a groupIncreasing amount of ___________ increases size. Increases right to left across a period Effective nuclear charge, Shells Due to _______________
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