ElectronegativityElectronegativityδ+δ–δ0δ0HClHHElectronegativityElectronegativity• Electronegativity describes how electrons are shared in a compound• Consider the compound HCl• The electron clouds represent where the two electrons in the HCl bond spend their time (sizes of atoms are not being shown)• The shared electrons spend more time around Cl than H. In other words Cl is more electronegative than H.lδ+δ–Electronegativitytabletable• The relative attraction for electrons is summarized in figure 7.11 (pg. 255)• These numbers are derived from several factors including EA, IE, ENC, atomic radius• You do not need to understand where the numbers come from• You need to know that a high number means the element has a greater pull on electrons• You will also need to calculate the difference between values to estimate the % ionic or % covalent character of a bond• PE 12 (pg. 256). Reference: 7.10.
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