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.
Where did lead get its name? Lead is an Anglo-Saxon word for the metal that has been used and known about since ancient times. The symbol Pb comes from the Latin word for lead, plumbum. The Romans used lead for making pipes, which is where the word plumber comes from as well. Isotopes Lead occurs naturally in the form of four isotopes. The most common isotope is lead-208. Interesting Facts about Lead. For many years lead and tin were thought to be the same metal. Lead was called plumbum nigrum for black lead and tin was called plumbum album for white lead. Over one million tons of lead is recycled each year. People have known about lead poisoning since Ancient China and Ancient Greece. The element is a member of the carbon group (column 14) in the periodic table.