Windows has a Sound window that allows you to manage your computer's audio settings and devices. If you cannot hear sound when it should be playing, head to the Sound window and tell Windows to select the audio input device you are using. 1. Click the Start button and type mmsys.cpl..
The atomic number of lead is 82. That tells us that electrically neutral lead has 82 protons and 82 electrons. The three stable isotopes of lead are 206 Pb, 207 Pb, and 208â¦ Pb. These isotopes have 124, 125, and 126 neutrons per each atom, respectively.
The Sulfide Mineral, Galena, a lead sulfide, PbS, is the most important ore mineral of lead. It can contain 86% lead. Its metallic, lead-gray cubic crystals (isometric system) and cubic, perfectly cleavable masses are distinctive and characteristic.