For a two element ionic compound, the naming is simple. The first part of the name is the name of the metal element. The second part is the name of the nonmetal element, with the suffix â-ide.â. 1  Example: Al 2 O 3.
Exploration & Excavation in Chaco Canyon. It's believed that the first Europeans to see Chaco Canyon came in the 17th Century, when Spanish soldiers engaged in military actions against the Navajos first entered the Chaco area.
The first references [to the taco] in any sort of archive or dictionary come from the end of the 19th century. And one of the first types of tacos described is called tacos de minero âminerâs tacos. So the taco is not necessarily this age-old cultural expression; itâs not a food that goes back to time immemorial.y theory is that it dates from the 18th century and the silver mines in Mexico, because in those mines the word âtacoâ referred to the little charges they would use to excavate the ore. These were pieces of paper that they would wrap around gunpowder and insert into the holes they carved in the rock face.