| slovo | definícia |
strontium
(encz) | strontium,stroncium n: [chem.] luke |
Strontium
(gcide) | Strontium \Stron"ti*um\, n. [NL. See Strontia.] (Chem.)
A metallic element of the calcium group, always naturally
occurring combined, as in the minerals strontianite,
celestite, etc. It is isolated as a yellowish metal, somewhat
malleable but harder than calcium. It is chiefly employed (as
in the nitrate) to color pyrotechnic flames red. Symbol Sr.
Atomic weight 87.3.
[1913 Webster] |
strontium
(wn) | strontium
n 1: a soft silver-white or yellowish metallic element of the
alkali metal group; turns yellow in air; occurs in
celestite and strontianite [syn: strontium, Sr, {atomic
number 38}] |
strontium
(elements) | strontium
Symbol: Sr
Atomic number: 38
Atomic weight: 87.62
Soft yellowish metallic element, belongs to group 2 of the periodic
table. Highly reactive chemically. Sr-90 is present in radioactive
fallout
and has a half-life of 28 years. Discovered in 1798 by Klaproth and
Hope,
isolated in 1808 by Humphry Davy.
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| | podobné slovo | definícia |
rubidium-strontium dating
(encz) | rubidium-strontium dating, n: |
strontium 90
(encz) | strontium 90, n: |
Strontium
(gcide) | Strontium \Stron"ti*um\, n. [NL. See Strontia.] (Chem.)
A metallic element of the calcium group, always naturally
occurring combined, as in the minerals strontianite,
celestite, etc. It is isolated as a yellowish metal, somewhat
malleable but harder than calcium. It is chiefly employed (as
in the nitrate) to color pyrotechnic flames red. Symbol Sr.
Atomic weight 87.3.
[1913 Webster] |
rubidium-strontium dating
(wn) | rubidium-strontium dating
n 1: geological dating based on the proportions of radioactive
rubidium into its decay product strontium; radioactive
rubidium has a half-life of 47,000,000,000 years |
strontium 90
(wn) | strontium 90
n 1: a radioactive isotope of strontium (with the mass number
90) that is present in the fallout from nuclear explosions;
can be assimilated like calcium into bones |
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