Group I elements have 1 electron in their valence shell; group II elements have 2 electrons in their valence shell. So B can't be right. Right?
Many profs consider A to be true; however, technically, it is Francium which is most reactive in group I. The reason those profs give is that Fr is not present except in minute quantities. I think the correct answer to the problem is D.
7. Which of the following is true?
A. Cesium is the most active group 1 metal, because its valence electron is held more tightly than the others in the same group.
B. Group 1 elements are more reactive than the group 2 elements because they have more valence electrons to lose.
C. The least reactive element in group 2 is the one with the largest atomic radium and the least amount of attraction between the
nucleus and the valence electrons.
D. Lithium is the least reactive element in group 1, because it is the smallest and holds its valence electron more tightly than the
others in the same group.
I'm guessing it's B?
1 answer
1 answer