Professional nice guy EC writes in:

Your Czarness:

As I recall their used to be a third and common form of bond: the metallic bond, in which the nuclei shared an electron cloud.

Wikipedia seems to remember it also.

Have you and your colleagues “disappeared” it?

Just wondering if we will need to revise our textbooks again?

Well, the two most essential are the covalent (nonmetal and nonmetal molecules), the ionic (between metal and nonmetal molecules); the metallic bond is actually a form of ionic bond, although because it is purely limited to a metal-to-metal bond, sometimes gets listed separately. However, because it involves positive ions moving in a cloud of electrons, it’s actually an ionic bond.

That said, there really are other types of bonds beyond ionic and covalent.

• The Metallic Bond is one you mentioned already.
• The Polar Covalent Bond is one in which the sharing of the electron pair is unequal and produce a dipole moment.
• The James Bond, in which the electron cloud is shaken, but not stirred.
• The Mojito Bond, in which the electron cloud is muddled with mint leaves and powdered sugar.
• The Teasury Bond, in which the electron cloud has a 20 to 30-yaer maturity, although generally these electrons reorganize around 10-year-notes.
• The Barry Bond has an artificially induced electron cloud.
• The Auto Bond, which Americans think the electron cloud can move as fast as it wants, but actually is a highly regulated German system offering few of the driving thrills you hear about.
• The Male Bond, in which the electrons share a couple of beers, discover they both hate the Yankees, and then get Thai food while staying up until 2am watching X-Men.

Eh, the stuff you learn on our site.

The Czar of Muscovy

Божію Поспѣшествующею Милостію Мы, Дима Грозный Императоръ и Самодержецъ Всероссiйскiй, цѣсарь Московскiй. The Czar was born in the steppes of Russia in 1267, and was cheated out of total control of all Russia upon the death of Boris Mikhailovich, who replaced Alexander Yaroslav Nevsky in 1263. However, in 1283, our Czar was passed over due to a clerical error and the rule of all Russia went to his second cousin Daniil (Даниил Александрович), whom Czar still resents. As a half-hearted apology, the Czar was awarded control over Muscovy, inconveniently located 5,000 miles away just outside Chicago. He now spends his time seething about this and writing about other stuff that bothers him.