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Explain why the electron affinity of lithium is slightly favorable (exothermic), whereas the electron affinity of beryllium is unfavorable (endothermic). Contrast these trends with the ionization energy trends of these two elements.
what are the following trends in the periodic table?
a) changes in the atomic diameter across a period and down agroup
b) changes in the ionic diamter of cations and anions
c) changes in ionization energy
d) changes in electron affinity
e) changes in metallic behavior
f) changes in acidity across a period