Consider the elements F, Na, and Al. Rank these elements in terms of their atomic radii from largest to smallest. Rank these elements in ionization energy from largest to smallest. Rank these elements in electronegativity from largest to smallest. The element with the highest electronegativity is fluorine.
Electron affinity is the energy required to attach an electron to a gaseous neutral atom.
The electron affinity if fluorine is large and positive. The atomic symbols of the elements involved 28. SO 4 2- is an example of an electron deficient compound. 2- is an example of an electron deficient compound. PF 3 is an example of an expanded shell compound.