Due to the increased stability of its precisely half-filled electrical arrangement, P's IE1 is higher than S's. Additionally, because the electron in Mg must be taken from a 3s- orbital while the electron in Al must be removed from a 3p orbital, Mg has a larger IE1 than Al. MgPaAs is the correct response.
The ionization energy gauges an element's capacity to engage in chemical reactions requiring the donation of electrons or the production of ions. It is often connected to the type of chemical bonds that exist between the components in the compounds they form. See also electron affinity and binding energy.
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