CHEM 105N 1st Edition Lecture 13 Outline of Last Lecture I. FillingII. Orbital DiagramsIII. Electron Configuration:IV. Abbreviated Configurations:Outline of Current Lecture I. Valence ElectronsII. Electron-Dot SymbolsIII. Atomic SizeIV. Ionization EnergyV. Metallic CharacterCurrent LectureI. Valence Electrons:- Determine the chemical properties of the elements- Are the electrons in the outermost, highest energy level- Related to group number of elementEx.Be: 1s2.2s2 Mg: 1s2.2s2.2p6.3s2.Ca: [Ar]4s2Sr: [Kr]5s2II. Electron-Dot Symbols:- Valence electrons are represented as dots around the symbol for each element- In a group, all electron-dot symbols have the same number of valence electronsEx.·Mg·Na·III. Atomic Size:- Described using the atomic radius- Distance from the nucleus to valence electrons- Atomic radius INCREASES as period increases and group decreasesThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.IV. Ionization energy:-Energy it takes to remove a valence electron from an atom in gaseous state-Ionization INCREASES as period decreases and group increasesV. Metallic Character:- Increases when an element can lose its valence electrons more easily- Metallic character INCREASES as period decreases and group
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