Which element has the lowest ionization energy?
a. argon (ar)
b. bromine (br)
c. cesium (cs)
d. nickel (ni)

C the answer is cesium, study's show that it has the lowest ionization out of all elements. Hope this helped!

C. Cesium because ionization energy increases as you move from left to right across a period and from down up a column of the periodic table, making a diagonal pattern from the bottom left corner to the top right of the periodic table.

Ethene molecular fórmula= c2h4molecular weight = 29.046g/molhope it : )