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Strontium is the second element placed in the 5th period. It is an alkaline earth metal , a relatively reactive group, although not nearly as reactive as the alkali metals . Like rubidium, it has 5 electron shells or energy levels , and in accordance with the Madelung rule it has two electrons in its 5s subshell .
Period: period 5: Block s ... Strontium is a chemical element; it has symbol Sr and atomic number 38. An alkaline earth metal, strontium is a soft silver-white ...
Period 4 includes the biologically essential elements potassium and calcium, and is the first period in the d-block with the lighter transition metals. These include iron , the heaviest element forged in main-sequence stars and a principal component of the Earth, as well as other important metals such as cobalt , nickel , and copper .
Strontium and barium have fewer applications than the lighter alkaline earth metals. Strontium carbonate is used in the manufacturing of red fireworks. [75] Pure strontium is used in the study of neurotransmitter release in neurons. [76] [77] Radioactive strontium-90 finds some use in RTGs, [78] [79] which utilize its decay heat.
The trends in group 5 follow those of the other early d-block groups and reflect the addition of a filled f-shell into the core in passing from the fifth to the sixth period. All the stable members of the group are silvery-blue refractory metals, though impurities of carbon, nitrogen, and oxygen make them brittle. [28]
In the periodic table of the elements, each column is a group.. In chemistry, a group (also known as a family) [1] is a column of elements in the periodic table of the chemical elements.
This page shows the electron configurations of the neutral gaseous atoms in their ground states. For each atom the subshells are given first in concise form, then with all subshells written out, followed by the number of electrons per shell.
Based on their likely chemical properties, elements 157–172 are placed by both forms as eighth-period congeners of yttrium through xenon in the fifth period; [19] this extends Nefedov et al.'s placement of 157–164 under yttrium through palladium, [18] and agrees with the chemical analogies given by Fricke et al. [17]