94 137 871 Tool description: The periodic table of elements is a list of chemical elements arranged from small to large according to the atomic number, which is convenient for you to consult and use. Recommendation tool: Tool label:
As a result, this chart actually displays the mass number of a specific isotope for each element. An element's complete, unrounded atomic 238 U 93 NEPTUNIUM PLUTONIUM AMERICIUM Np Pu Am Cm Bk 237 244 243 CURIUM 94 95 96 97 98 247 BERKELIUM CALIFORNIUM EINSTEINIUM 247 Cf 251 99 Es Fm...
This periodic table of elements provides comprehensive data on the chemical elements including scores of properties, element names in many languages and most known nuclides (Isotopes). Below the table there is a "Periodic Table Sorted By" section with links that will sort chemical elements by vario...
The reason for rescaling all data is as follows. It is common to see, say, solar abundances expressed as the number of atoms of the element relative to a scale upon which the abundance of hydrogen is defined as 1012. This makes comparison with, say, crustal abundances difficult, since crus...
, silver, gold, mercury, tin, lead, and other elements have been known since ancient times and were used to make jewelry, coins, and tools. Phosphorus became the first element to be discovered by Hennig Brand in 1649. It is known as the first scientific discovery of a chemical element....
The atomic number of an element is equal to the total number of protons in the nucleus of the atoms of that element. The atomic number can provide insight into the electronic configuration of the element. For example, carbon has an electron configuration of [He] 2s22p2, since its atomic ...
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In theory, each different lamp should produce a different color of light characteristic of its element. Unfortunately, the lamps all use neon as a carrier gas: You generally have to have such a carrier gas present to maintain the electric arc. Neon emits a number of very strong orange-red ...
, silver, gold, mercury, tin, lead, and other elements have been known since ancient times and were used to make jewelry, coins, and tools. Phosphorus became the first element to be discovered by Hennig Brand in 1649. It is known as the first scientific discovery of a chemical element....
The first to recognize these regularities was the German chemist Johann Wolfgang Döbereiner who, in 1829, noticed a number of triads of similar elements: Some triads Element Atomic massDensity chlorine 35.5 0.00156 g/cm3 bromine 79.9 0.00312 g/cm3 iodine 126.9 0.00495 g/cm3 calcium 40.1 1.55 ...