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How many electrons does a neutral potassium atom have?
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2. Atoms & Elements
The Atom
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In a water molecule (H₂O), which atom has a slightly negative charge?
A
Oxygen
B
Hydrogen
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Understand that in a water molecule (H₂O), there are two hydrogen atoms and one oxygen atom.
Recall that oxygen is more electronegative than hydrogen. Electronegativity is the tendency of an atom to attract electrons towards itself.
In a covalent bond, the more electronegative atom will attract the shared electrons more strongly, causing a partial negative charge on that atom.
Since oxygen is more electronegative than hydrogen, the shared electrons in the O-H bonds are pulled closer to the oxygen atom.
As a result, the oxygen atom in a water molecule carries a slightly negative charge, while the hydrogen atoms carry a slightly positive charge.
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