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Noble gas configuration of Europium (Eu)

Explanation:We are supposed to identify the element with the configuration given.It is known as noble gas configuration of an element, where noble gases are used to write the configuration of the element.This is done by first identifying the atomic number of the element in question, then identify a noble gas which has a less atomic number that is close to the element in Question.Then distribute the remaining electrons on the remaining orbitals of the element.

In this case;

The noble gas configuration is [Xe]6s²4f⁷

The noble gas is xenon which has an atomic number of 54

Therefore;

The atomic number of the element in question is 54 + 2 +7 = 63

Hence,

The element in question is Europium (Eu) with an atomic number of 63

Thus;

[Xe]6s²4f⁷ is the noble gas configuration of Europium (Eu)

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