The electronegative charge on 2:1 type silicate clays is due primarily to ________
A) the preponderance of tetrahedral sheets compared to octahedral sheets
B) extremely small size of the individual colloid particles
C) substitution of one metallic atom for another in the crystal structure of the clay
D) ionization of surface OH groups
E) the effect of pH on the presence of H+ ions in the exchange complex
C
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