Summary BTEC applied science/forensics unit 1 chemistry: electronegativity
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Course
Unit 1 - Principles and Applications of Science I
Institution
PEARSON (PEARSON)
These are my notes from class on electronegativity, they can be used for unit 1 chemistry in both the BTECs applied science and forensic and criminal investigation
Electronegativity
Electronegativity - A measure of the attraction of a bonded atom for a pair of electrons in a
covalent bond
● In molecules such as H2+ or Cl2+ the electrons are shared equally
● In molecules containing other elements, the most electronegative element attracts
the electrons
Pauling's electronegativity scale
● Measure of electronegativity
● Runs on a scale of 0-4
● Higher number = more electronegative
● Fluorine is the most electronegative at 4
● Electronegativity increases diagonally across the periodic table, finishing at fluorine
and excluding noble gases
Electronegativity depends on:
● Nuclear charge
● Atomic radius
● Shielding
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