X is an element with 3 isotopes, X-139, X-140 and X-141. The relative abundance of each isotope is as shown in the pie chart. Reveal the identity of X. Given the average atomic masses of La, Ce and Pr are respectively 138.9055 amu, 140.1150 amu and 140.9076 amu.

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A: The diagram of fluoride ion-selective electrode is as follows-

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Atoms and Molecules

An atom is the smallest unit of an element that possesses all the properties of that particular element. Molecules are the smallest unit of a substance that possess all the properties of that particular substance.