Formula:
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Definition: Allred-Rochow's electronegativity measures the charge experienced by an electron on the "surface" of an atom.
Purpose: It provides a quantitative measure of an atom's ability to attract electrons in chemical bonds.
The calculator uses the formula:
Where:
Explanation: The formula converts Mulliken's electronegativity scale to Allred-Rochow's scale using a linear transformation.
Details: Electronegativity values help predict bond polarity, molecular properties, and chemical reactivity.
Tips: Enter the Mulliken's electronegativity value in joules. The value must be > 0.
Q1: What's the difference between these electronegativity scales?
A: Mulliken's scale is based on ionization energy and electron affinity, while Allred-Rochow's relates to nuclear charge and atomic radius.
Q2: What are typical values for Mulliken's electronegativity?
A: Values typically range from about 2.5 J for cesium to 4.0 J for fluorine.
Q3: Why are there constants in the conversion formula?
A: The constants align the two scales since they were developed using different reference points and methodologies.
Q4: Can I use this for all elements?
A: Yes, the conversion works for all elements, though accuracy may vary slightly for some transition metals.
Q5: How precise is this conversion?
A: It provides a good approximation, but for precise work, consult original literature values.