fokiling.blogg.se - Silicon average atomic mass

Silicon-based life, like the Horta from "Star Trek," may not be entirely science fiction, according to researchers from Caltech.The nickname first appeared in 1971 in the newspaper "Electronic News." Silicon Valley gets its name from the silicon used in computer chips.The element appears to be an important nutrient that helps confer resistance to disease, according to a 1994 paper in the journal Proceedings of the National Academy of Sciences. Plants use silicon to strengthen their cell walls.It ranks a 9-9.5 on the Mohs hardness scale, slightly less than diamond, which has a hardness of 10.

Silicon carbide (SiC) is almost as hard as a diamond, according to the Institute of Materials, Minerals, and Mining.

The gemstone is a form of silica bound with water molecules.

Love the iridescence of an opal? Thank silicon.

When inhaled over long periods of time, it can cause a lung disease known as silicosis. Because it resists heat so well, silicone has increasingly been used to make kitchen tools, such as oven mitts and baking sheets. Silicone is made of silicon along with oxygen, carbon and hydrogen.

Silicon isn't the same thing as silicone, that famous polymer found in breast implants, menstrual cups and other medical technology.

Inscribed in microscopic font on the disc are 73 messages, each from a different country, expressing wishes of goodwill and peace.

When the Apollo 11 astronauts landed on the moon in 1969, they left behind a white pouch containing a silicon disc slightly bigger than a silver dollar.

(Other semiconductors besides silicon can be used in transistors, as well.) Who knew? Electrons, which are negatively charged, are drawn to the positive charge, allowing them to make the leap across the pure-silicon segment. When the electricity flows, the plate becomes positively charged. To turn the switch to "on," a metal plate, connected to a power source, is placed near the crystal. The trace elements bond with the silicon atoms, freeing up electrons to move throughout the material, according to the University of Virginia.īy creating spaces of unadulterated silicon, engineers can create a gap where these electrons can't flow - like a switch in the "off" position. To make silicon into a transistor, the crystalline form of the element is adulterated with trace amounts of other elements, such as boron or phosphorous, according to Lawrence Livermore National Laboratory. Silicon is used in various ways in solar cells and computer chips, with one example being a metal-oxide-semiconductor field effect transistor, or MOSFET, the basic switch in many electronics. As a semiconductor, silicon is used to make transistors, which amplify or switch electrical currents and are the backbone of electronics from radios to iPhones. But the high-tech stuff is where the element really makes its mark.

Silicon is a main ingredient in very low-tech creations, including bricks and ceramics.

Berzelius heated silica with potassium to purify silicon, according to the Thomas Jefferson National Accelerator Facility, but today the refinement process heats carbon with silica in the form of sand to isolate the element. The isotope of carbon that has 6 neutrons is therefore C612.Silicon was first isolated in 1824 by Swedish chemist Jöns Jacob Berzelius, who also discovered cerium, selenium and thorium, according to the Chemical Heritage Foundation. An isotope of any element can be uniquely represented as XZA, where X is the atomic symbol of the element. In a typical sample of carbon-containing material, 98.89% of the carbon atoms also contain 6 neutrons, so each has a mass number of 12. The element carbon (C) has an atomic number of 6, which means that all neutral carbon atoms contain 6 protons and 6 electrons. The isotopes of an element differ only in their atomic mass, which is given by the mass number ( A), the sum of the numbers of protons and neutrons. All isotopes of an element have the same number of protons and electrons, which means they exhibit the same chemistry. Atoms that have the same number of protons, and hence the same atomic number, but different numbers of neutrons are called isotopes. Unlike protons, the number of neutrons is not absolutely fixed for most elements. Recall from Section 1.6 that the nuclei of most atoms contain neutrons as well as protons. German for “wolf stone” because it interfered with the smelting of tin and was thought to devour the tin \) Element Symbols Based on Names No Longer in Use Elementįrom Cyprium, Latin name for the island of Cyprus, the major source of copper ore in the Roman Empire