Chemistry Practice Problems Periodic Trends: Ionization Energy Practice Problems Solution: Figure Trends in first ionization energies of the ...

Solution: Figure Trends in first ionization energies of the elements.The value for astatine, At, is missing in this figure. To the nearest 100 kJ/mol,what estimate would you make for the first ionization energy of At?

Problem

Of those shown, Helium has the largest ionization energy and Cesium has the lowest. Hydrogen is much higher than other group 1 elements. The ionization energy of polonium is 812, Iodine is 1008, and Radon is 1037. An accessible periodic table can be found here: https://media.pearsoncmg.com/bc/bc_0media_chem/periodictable/table.html
Figure Trends in first ionization energies of the elements.

The value for astatine, At, is missing in this figure. To the nearest 100 kJ/mol,what estimate would you make for the first ionization energy of At?

Solution

We’re asked to make an estimate for the first ionization energy of astatine, At to the nearest 100 kJ/mol, based on the given figure.  


Recall that Ionization energy is the energy required to remove an electron from a gaseous atom or ion.


The trend of the ionization energies of the elements can be observed in the periodic table:


increases going from left to right of a period

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