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A period 3 element is one of the chemical elements in the third row (or period) of the periodic table of the chemical elements.The periodic table is laid out in rows to illustrate recurring (periodic) trends in the chemical behavior of the elements as their atomic number increases: a new row is begun when chemical behavior begins to repeat, meaning that elements with similar behavior fall into ...
The Gmelin rare earths handbook lists 1522 °C and 1550 °C as two melting points given in the literature, the most recent reference [Handbook on the chemistry and physics of rare earths, vol.12 (1989)] is given with 1529 °C.
For example, the melting point, the first three ionization energies, and the hydration energy are greater than those of neodymium and lower than those of samarium; [5] similarly, the estimate for the boiling point, ionic (Pm 3+) radius, and standard heat of formation of monatomic gas are greater than those of samarium and less than those of ...
A chemical element, often simply called an element, is a type of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number, or Z). [ 1 ] The definitive visualisation of all 118 elements is the periodic table of the elements , whose history along the principles of the periodic law was one of the founding ...
Periodic table of the chemical elements showing the most or more commonly named sets of elements (in periodic tables), and a traditional dividing line between metals and nonmetals. The f-block actually fits between groups 2 and 3 ; it is usually shown at the foot of the table to save horizontal space.
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Block indicates the periodic table block for each element: red = s-block, yellow = p-block, blue = d-block, green = f-block. Group and period refer to an element's position in the periodic table. Group numbers here show the currently accepted numbering; for older numberings, see Group (periodic table)
Three allotropes of metallic strontium exist, with transition points at 235 and 540 °C. [ citation needed ] The standard electrode potential for the Sr 2+ /Sr couple is −2.89 V, approximately midway between those of the Ca 2+ /Ca (−2.84 V) and Ba 2+ /Ba (−2.92 V) couples, and close to those of the neighboring alkali metals . [ 12 ]