A wave has 9.2 x 10-22 ) of energy. What is its wavelength?

Explanation:

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In this case, since the relationship between energy and wavelength is defined via the speed of light and the Planck's constant as shown below:

Since c stands for the speed of light and h for the so-called Planck's constant, we can compute the wavelength as follows:

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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.