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Find the first 20 elements of the periodic table in order of increasing atomic number, along with their symbols and names. Learn more about the properties, uses, and history of these elements and access more data pages on the chemical elements.
Interactive periodic table showing names, electrons, and oxidation states. Visualize trends, 3D orbitals, isotopes, and mix compounds. Fully descriptive writeups.
The first element in the periodic table with more than one electron is helium, which has two electrons. Dot-density diagrams for both these electrons are shown below. One electron is color coded in blue, and the other in green. Note that both electrons occupy the same orbital, namely, a 1 s orbital.
Learn how the periodic table organizes elements based on their electron configurations and properties. Find out how hydrogen, helium, and lithium fit into the 1n, 2n, and 3n shells, and what makes them stable or reactive.
The hydrogen of hydrogen bombs is actually the compound lithium hydride, in which the lithium is the lithium-6 isotope and the hydrogen is the hydrogen-2 isotope (deuterium). This compound is capable of releasing massive amounts of energy from the neutrons released by the atomic bomb at its core.
The sun is comprised of about 75% by mass of hydrogen and 24% of helium. The remaining one percent is made up of all the heavier elements. In the high temperatures of the sun, the hydrogen nuclei are fused together to eventually form helium.
Hydrogen Compounds Oxygen Compounds Chlorine Compounds; Hydrogen: 1.01: H 2: H 2 O, H 2 O 2: HCl: Helium: 4.00: None formed: None formed: None formed: Lithium: 6.94: LiH: Li 2 O, Li 2 O 2: LiCl: Beryllium: 9.01: BeH 2: BeO: BeCl 2: Boron: 10.81: B 2 H 6: B 2 O 3: BCl 3: Carbon: 12.01: CH 4, C 2 H 6, C 3 H 8: CO 2, CO, C 2 O 3: CCl 4, C 2 Cl 6 ...
