different between valences vs valencies

valences

valences From the web:

• what valances are in style
• valence chemistry
• what does valence mean
• valence electrons
• what are valences of elements
• valances for windows
• what are valences in biology
• carbon valency

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valencies

valencies From the web:

• what are valencies of elements
• what are valencies in chemistry
• what does valence mean
• what are valences used for
• what are the valencies of first 20 elements
• what are the valencies of sulphur
• what are the valencies of nitrogen
• what are the valencies of sulphur in so2 and so3