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Radioactive: 40 K, t 1/2 1.25 × 10 9 years; 87 Rb, t 1/2 4.9 × 10 10 years; 223 Fr, t 1/2 22.0 min. All the alkali metals have odd atomic numbers; hence, their isotopes must be either odd–odd (both proton and neutron number are odd) or odd–even ( proton number is odd, but neutron number is even).
ISBN 978-3-527-31338-9. Brunner, T (2000). "Chemical and structural analyses of aerosol and fly-ash particles from fixed-bed biomass combustion plants by electron microscopy". 1st World Conference on Biomass for Energy and Industry: proceedings of the conference held in Sevilla, Spain, 5–9 June 2000. London: James & James. ISBN 1-902916-15-8.
The organic compound 1,1,1-trichloroethane, also known as methyl chloroform and chlorothene, is a chloroalkane with the chemical formula CH 3 CCl 3. It is an isomer of 1,1,2-trichloroethane . A colourless and sweet-smelling liquid, it was once produced industrially in large quantities for use as a solvent . [ 5 ]
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A late-night home invasion led to a desperate shootout between an underwear-clad resident and a gun-toting intruder — leaving three people with bullet wounds, according to a shocking video from ...
The longest half-lives among them are 1.387 million years for beryllium-10, 99.4 thousand years for calcium-41, 1599 years for radium-226 (radium's longest-lived isotope), 28.90 years for strontium-90, 10.51 years for barium-133, and 5.75 years for radium-228. All others have half-lives of less than half a year, most significantly shorter.
Reactivity is a somewhat vague concept in chemistry. It appears to embody both thermodynamic factors and kinetic factors (i.e., whether or not a substance reacts, and how fast it reacts).
A period 1 element is one of the chemical elements in the first row (or period) of the periodic table of the chemical elements.The periodic table is laid out in rows to illustrate periodic (recurring) trends in the chemical behaviour of the elements as their atomic number increases: a new row is begun when chemical behaviour begins to repeat, meaning that analog elements fall into the same ...