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Atomic number (Z): 20: Group: group 2 (alkaline earth metals) Period: period 4: Block s-block Electron configuration [] 4sElectrons per shell: 2, 8, 8, 2: Physical properties
Some hydroxides of non-metallic elements are soluble in water; they are not included in the following table. Examples cited by Baes and Mesmer (p. 413) include hydroxides of Gallium(III), Indium(III), Thallium(III), Arsenic(III), Antimony(III) and Bismuth(III). Most hydroxides of transition metals are classified as being "insoluble" in water.
The next 0.75% is made up of the next five elements: potassium (K), sulfur (S), chlorine (Cl), sodium (Na), and magnesium (Mg). Only 17 elements are known for certain to be necessary to human life, with one additional element (fluorine) thought to be helpful for tooth enamel strength.
For copper labeling purposes, 100% of the Daily Value was 2.0 mg, but as of May 27, 2016, it was revised to 0.9 mg to bring it into agreement with the RDA. [ 212 ] [ 213 ] A table of the old and new adult daily values is provided at Reference Daily Intake .
This is an accepted version of this page This is the latest accepted revision, reviewed on 21 January 2025. Chemical element with atomic number 10 (Ne) This article is about the chemical element. For other uses, see Neon (disambiguation). Chemical element with atomic number 10 (Ne) Neon, 10 Ne Neon Appearance colorless gas exhibiting an orange-red glow when placed in an electric field Standard ...
Cerium is used as alloying element in aluminium to create castable eutectic aluminium alloys with 6–16 wt.% Ce, to which other elements such as Mg, Ni, Fe and Mn can be added. These Al-Ce alloys have excellent high temperature strength and are suitable for automotive applications (e.g. in cylinder heads ). [ 66 ]
The Occupational Safety and Health Administration has set the permissible exposure limit (PEL) to a time-weighted average (TWA) of 0.01 mg/m 3 (0.01 ppb), and the National Institute for Occupational Safety and Health (NIOSH) has set the recommended exposure limit (REL) to a 15-minute constant exposure of 0.002 mg/m 3 (0.002 ppb). [199]