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A Lewis diagram shows the valence electrons using dots. In the example... H has 1 valence electrons. Cl has 7 electrons. The Cl wants 8 valence electrons to be happy.
Looking at the diagram, let's count the electrons around chlorine.
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As you can chlorine has 8 electrons now, OK- so it had 7 to begin. Where did I get the 8th electrons (labelled as #1 in my example?)
so, basically only 7 came from Chlorine and the last one came from Hydrogen.
So hydrogen came in with one electron. That electron is shared by chlorine. We call that sharing of electrons ''covalent bonding''
it is also called ''molecular bonding''
Lewis structures show how electrons are shared between atoms.
Hope it was helpful! (:
Lewis diagram means lewis structure of molecules ...
e.g lewis diagram or structure of methane is :|dw:1378463791294:dw|
Hope itx helpfull c: