Tuesday was World Water Day 2011 and the theme for this year was ‘Water for Cities’. The theme for this weeks blogs posts will therefore be all about water.

So far, we have been focussing on the fact that water has a much higher boiling point than is prediced and that the reason could be pinned down to the hydrogen bond.

By Bidgee (Own work) [CC BY 3.0 (http://creativecommons.org/licenses/by/3.0)], via Wikimedia Commons

You may also remember that yesterday I posted a question asking:

‘How does the (relatively) strong bond hydrogen bond come to exist? What causes it? Where else is it found?’

For me, this answer is one of the corner stones of good, pre-university chemistry.

It relies on an appreciation of electronegativity (the ability of a covalent bond to attract electron density) and the factors that cause elctronegativity.

So, what causes electonegativity? That my friends is my next question and I will post the answer tomorrow.

If, on the other hand you feel that you can answer this question, why not post a response below? 🙂