Teething refers to the process of new teeth rising or erupting through the gums. Teething can begin in infants as young as 2 months of age, even though the first tooth usually does not appear until about 6 months of age. Some dentists have noted a family pattern of early, average, or late teethers.
noble metal. 1. any of a number of metals, as gold, silver, mercury, or platinum, that resist oxidation when heated in air, and solution by inorganic acids. But now, at the first and yet final trial, she is proved and found to be of noble metal. There was a noble metal collarâabout thirty-two, the size would have been, on the usual scale.
Noble Gases. The noble gases are the elements at the far right-hand column of the periodic table: helium, neon, argon, xenon, and radon. Because of the group they belong to, they each have a full valence shell or level. In the case of helium, a full valence shell has two electrons, and in the remaining noble gases, eight electrons make up a full valence shell.