What is the difference between 12C and 13C?
A) 12C always forms nonpolar covalent bonds with hydrogen, whereas 13C forms polar covalent bonds.
B) 12C can form four covalent bonds and 13C only forms three.
C) 12C has one less proton than 13C.
D) 12C has one less neutron than 13C.
C) 12C has one less neutron than 13C.
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