Polar key

A co-priced bond, called a polarity bond, formed between atoms of different elements. Different kinds of atoms, their electrons must be different, so the attraction to bonded electrons is different, the common electrons must be biased to attract electrons strong (i.e., large electrical negative) atomic side, so that the atomic belt part of the negative charge (δ -), and the other atomic belt part of the positive charge (δ ). In this way, the two atoms are unevenly distributed after the bond, forming a co-priced bond with polarity. The polarity size of the key depends on the degree of difference in the ability of two atoms to attract bonded electrons. Based on the electro-negative difference between the two elements

X

can generally estimate the polarity size of the co-priced key. It is generally believed that:

O

<

X

<

1.7

, forming the polarity key;

ion bonds

>

1.7

X O to form non-polarity bonds. From this point of view, the non-polarity bond, polarity bond, ion bond between a gradient process. Ion bonds can be regarded as the most polar keys, the two have both essential differences and no strict boundaries. Molecules formed by polar bonds can be polar molecules or non-polar molecules, depending on the symmetry of the structure of the molecules themselves.