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A period 7 element is one of the chemical elements in the seventh row (or period) of the periodic table of the chemical elements.
- Period 7 element - Simple English Wikipedia, the free ...
A period 7 element is an element in the seventh period (row)...
- Period 7 element - Simple English Wikipedia, the free ...
Un elemento del periodo 7 es aquel elemento químico en la séptima fila (o periodo) de la tabla periódica, incluidos los actínidos. La mayoría de los elementos pertenecientes a este período son muy inestables, muchos de ellos radiactivos.
Group 7, numbered by IUPAC nomenclature, is a group of elements in the periodic table. It contains manganese (Mn), technetium (Tc), rhenium (Re) and bohrium (Bh). This group lies in the d-block of the periodic table, and are hence transition metals.
- silvery metallic
- 7.21 g·cm −3
- 2334 K (2061 °C)
- 1519 K (1246 °C)
118 chemical elements have been identified and named officially by IUPAC. 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]
Un elemento del periodo 7 es aquel elemento químico en la séptima fila de la tabla periódica, incluidos los actínidos. La mayoría de los elementos pertenecientes a este período son muy inestables, muchos de ellos radiactivos.
No element heavier than einsteinium (element 99) has ever been observed in macroscopic quantities in its pure form, nor has astatine; francium (element 87) has been only photographed in the form of light emitted from microscopic quantities (300,000 atoms).
