Element Properties: 1-7 atomic numberby Izzy X. Product specialist
Carbon is found free as the mineral graphite or as diamonds. It is essential to all animal and plant life. Recommended Features
- Nitrogen is an odorless gas, usually obtained by the fractional distillation of liquid air.
- Boron is relatively rare, and always found combined with oxygen in borates. It is extremely hard and brittle, and is found in two allotropic formscrystalline and amorphous.
- Beryllium is very rare, its pricipale ore is beryl, a complex aluminosilicate. When beryl has traces of chromium impurities, it is emerald.
- Lithium is a silvery white metal that turns yellow when exposed to moist air. When heated sufficiently, it emits light radiation that is red in color.
- Helium is a colorless, odorless, tasteless, nonflammable, monatomic inert gas. It is obtained from natural gas deposits by liquefying all other constituents and collecting the helium.
Review on Element Properties: 1-7 atomic numberHYDROGEN
Atomic symbol: H
Atomic weight: 1.00794
Atomic number: 1
Electron configuration: 1
Oxidation states: 1
State of matter: gas
Discovered in 1790 by Henry Cavendish
Boils at-252.8C, melts at-259.14C
Hydrogen is a colorless, odorless, tasteless gas that can be flammable or explosive when mixed with air, oxygen, and chlorine. Hydrogen is not very reactive at room temperature, but at higher temperatures it burns vigorously and often explosively in air or oxygen to form water. In the presence of a catalyst and under pressure, hydrogen will combine with vegetable oils to form solid fats used as shortening, in a process known as hydrogenation. This process is extensively used in the refining of oil products to increase the yields of gasoline. It is also commonly used to make ammonia and many other chemical substances. Other uses are to fuel rockets and in fuel cells to generate electricity.
Atomic symbol: He
Atomic weight: 4.002602
Atomic number: 2
Electron configuration: 2
Oxidation states: 0
State of matter: gas
Noble gas element
Discovered in 1895 by Sir William Ramsay
Boils at 268.9C, melts at 272.2C
Helium is a colorless, odorless, tasteless, nonflammable, monatomic inert gas. It is obtained from natural gas deposits by liquefying all other constituents and collecting the helium. The percentage obtained from these deposits may range from 1% to 2%. It is sometimes used to fill balloons and airships, along with many other scientific applications.
Atomic symbol: Li
Atomic weight: 6.941
Atomic number: 3
Electron configuration: 2-1
Oxidation states: +1
State of matter: solid
Discovered in 1817 by Johan August Arfwedson
Boils at 1342C, melts at 180.5C
Lithium is a silvery white metal that turns yellow when exposed to moist air. When heated sufficiently, it emits light radiation that is red in color. Lithium is a good electron source in photoelectric cells and cyclotrons.
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Created on Mar 24th 2021 01:32. Viewed 69 times.
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