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Please can someone help me with this – I’m sure it’s simple to those who know but I have been thinking about these 2 problems for ages (and reading up on every website I can find) and still no answer. I am trying to get a basic understanding of this and seem to be getting nowhere

1st

Water Molecules = 2 hydrogen atoms with 1 electron each. Plus 1 Oxygen atom with 8 electrons (with the 8 electrons being put – for want of a better word, into 4 pairs ;-). 2 of these pairs will form covalent bonds between the H and the O. 1 pair will be the Lone pair (to bond with another H in a dimer) and the other pair doesn’t bond. Is that right ??

If it is right how does the hydrogen bond take place been each molecule to form a Tetrahedral shape (you'd need 4 pairs and you only have 3 ??)– is there just 1 electron needed for a hydrogen bond and 2 for a covalent bond ?? If it’s 2 where do the other 2 come from ??

2nd (this may be a silly question but I have thinking about this for a long time ;-)

If the angle (of the hydrogen bond) is 104.5degrees, how can 6 molecules form a hexagon with 720 degrees ??

Thanks for your time in reading my (hopefully simple to you) questions.