It is helpful to think of chemical bonding as being on a sliding scale, where at one extreme there is pure covalent bonding, and at the other there is pure ionic bonding. Most chemical bonds lie somewhere between those two extremes. When a chemical bond is formed between two elements, the differences in the electronegativity of the atoms determine where on the sliding scale the bond falls.
The freshman class resulting from the pool of 12,375 students admitted could number nearly 3,100, pushing total UCR enrollment to near 13,000 next fall - up from 11,600 this year.
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