https://padlet.com/tahtahleach2003/szspqwde8xt8 by Tahlia Leach en-us 2018-03-04 22:34:44 UTC 2023-01-19 06:02:22 UTC hello@padlet.com tahtahleach2003 https://padlet.com/tahtahleach2003/szspqwde8xt8/wish/237864789 hydrogen
symbol- H
atomic number- 1]]> 2018-03-04 22:41:00 UTC https://padlet.com/tahtahleach2003/szspqwde8xt8/wish/237864789 tahtahleach2003 https://padlet.com/tahtahleach2003/szspqwde8xt8/wish/237865122 2018-03-04 22:43:44 UTC https://padlet.com/tahtahleach2003/szspqwde8xt8/wish/237865122 tahtahleach2003 https://padlet.com/tahtahleach2003/szspqwde8xt8/wish/240667693 Hydrogen is the smallest chemical element because it consists of only one proton in its nucleus. Its symbol is H, and its atomic number is 1. It has an average atomic weight of 1.0079 amu, making it the lightest element. Hydrogen is the most abundant chemical substance in the universe, especially in stars and gas giant planets. At standard temperature and pressure, hydrogen is a nontoxic, nonmetallic, odorless, tasteless, colorless, and highly combustible diatomic gas with the molecular formula H₂. ]]> 2018-03-12 01:30:15 UTC https://padlet.com/tahtahleach2003/szspqwde8xt8/wish/240667693 tahtahleach2003 https://padlet.com/tahtahleach2003/szspqwde8xt8/wish/240668638 Hydrogen gas (H₂) is highly flammable and will burn in air at a very wide range of concentrations between 4 percent and 75 percent by volume. The enthalpy of combustion for hydrogen is -286 kJ/mol, and is described by the equation. Hydrogen gas can also explode in a mixture of chlorine (from 5 to 95 percent). These mixtures can explode in response to a spark, heat, or even sunlight.]]> 2018-03-12 01:36:45 UTC https://padlet.com/tahtahleach2003/szspqwde8xt8/wish/240668638 tahtahleach2003 https://padlet.com/tahtahleach2003/szspqwde8xt8/wish/240669406 A hydrogen atom is an atom of the chemical element. The electrically neutral atom contains a single positively charged proton  and a single negatively charged electron bound to the nucleus by the force. Atomic hydrogen constitutes 75% of the baryonic mass of the universe.]]> 2018-03-12 01:41:25 UTC https://padlet.com/tahtahleach2003/szspqwde8xt8/wish/240669406 tahtahleach2003 https://padlet.com/tahtahleach2003/szspqwde8xt8/wish/240669747 Henry cavendish discovered hydrogen, on 1766. ]]> 2018-03-12 01:43:15 UTC https://padlet.com/tahtahleach2003/szspqwde8xt8/wish/240669747 tahtahleach2003 https://padlet.com/tahtahleach2003/szspqwde8xt8/wish/240670782 Hydrogen fuel cells are a clean, reliable, quiet, and efficient source of high-quality electric power. They use hydrogen as a fuel to drive an electrochemical process that produces electricity, with water and heat as the only by-products. The two main applications for hydrogen fuel cells are in stationary power sources and hydrogen fuel cell vehicles ]]> 2018-03-12 01:49:47 UTC https://padlet.com/tahtahleach2003/szspqwde8xt8/wish/240670782 tahtahleach2003 https://padlet.com/tahtahleach2003/szspqwde8xt8/wish/242619127 2018-03-15 22:29:40 UTC https://padlet.com/tahtahleach2003/szspqwde8xt8/wish/242619127