Periodic table, noble gases group without symbols (difficult)

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Periodic table, noble gases group without symbols (difficult)

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The noble gases are a group of monoatomic, odorless, colorless chemical elements and have a very low chemical reactivity. Pierre Janssen and Joseph Norman Lockyer were the first to discover, in the 19th century, a noble gas which they called helium when they examined the chromosphere of the Sun, called in Greek ἥλιος (helios).

The periodic table of the elements is the way proposed by Dmitri Mendeléyev in 1869 to arrange the chemical elements, which are ordered by their atomic number, their electron configuration and their chemical properties. Since its first appearance, this table has been increasing with the discovery of new chemical elements, some present in nature and others originated by man.

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