(4 Points) An element is made up of three isotopes, one of which (sºx has a % abundance of 3.09%, while the other two are unknown. If the mass of the three isotopes are 28x(mass = 27.9769), 29x(mass = 28.9765) and
30X(mass = 29.9738), and the atomic weight of the element is 28.0855 amu, what are the % abundances of
the other two isotopes?

the mass of the cathode increases because ions from the solution get reduced to atoms and become part of the cathode.

explanation:

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the seeing the electronic configuration we can say that the element is fluorine.

fluorine is the most electronegative element in the periodic table.

but by only seeing the configuration we cannot say about its reactivity because we don't know if its configuration after excitation or by addition of electrons.

but if not then, it is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. as the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine.