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Coordinate Covalent Bonding is like Borrowing Library Books

Coordinate covalent or dative bonding is often described in a simple fashion by saying that it involves one atom donating or giving a pair of electrons to another, so that this bonding partner can have a full outer shell. When electrons are counted up in an electronic dot diagram, this coordinate covalent pair is counted with each of the atoms. It is similar to borrowing a pair of books from the public library ... the books are given to you and you treat them essentially as if they belonged to you; yet at the same time the books are counted as being part of the library collection.
Source: Original
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Covalent Bond Types are like Eating in a Restaurant

A nonpolar covalent bond forms when electrons are shared equally between atoms. A polar covalent bond forms when electrons are not shared equally ... the more electronegative atom "gets" more electrons than he gives away by sharing. A coordinate covalent bond is imagined to form when one atom donates the entire pair of electrons which are shared with the other atom.
A restaurant analogy for these situations could be as follows:
A nonpolar covalent bond is formed if you give your friend half of your cheeseburger in exchange for half of his chicken burger. A polar covalent bond would be like your friend taking all of your cheeseburger and in exchange giving you just a small bite of his chicken burger. A coordinate covalent bond forms if you notice a homeless person outside, bring them into the restaurant, and give them your whole dinner to eat.
Source: Original
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Resonance Hybrid is like a Mule

The actual electronic structure of a molecule or ion which involves resonance is often explained by saying that it is the average of several contributing electronic structures which are drawn so as to show the double bond in several different locations in the species. In order to remind students that the actual resonance hybrid structure doesn't alternate from one contributing structure to another from time to time, but rather has its own special structure all the time, it is convenient to use the analogy that a resonance hybrid is like a mule . When you look at a mule ( which is a cross between a horse and a donkey) you don't see a donkey at one time and a horse at another... you see a mule at all times.
Source: Sienko, M. J. and Plane, R. A. Chemistry Toronto: McGraw-Hill, 1964 p.94
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