Why is Water a polar molecule?

  
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Hi,

In my mind, this would give the Hydrogens and the Oxygen a negative charge, as, after the electrons have been shared, they all have more electrons than protons. So, why, in a water molecule, is the Hydrogen end slightly positive??

And also, if all the elements in simple covalent molecule have a full outer electron shell, giving them a negative charge, why do Hydrogen atoms attract lone electrons in the outer shell of other atoms in neighbouring molecules, to form the inter-molecular Hydrogen bon

Please help.
Thanks!

I didn't find the right solution from the Internet.

References:http://forum.notebookreview.com/threads/chemistry-question-why-is-water-a-polar-molecule.294528/

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