Hydrogen is unique among the elements because _.
1) It is not really a member of any particular group.
2) Its electron is not at all shielded from its nucleus.
3) It is the lightest element.
4) It is the only element to exist at room temperature as a diatomic gas.
5) It exhibits some chemical properties similar to those of groups 1A and 7A.
A) 1, 4, 5
B) 1, 2, 3, 5
C) 2, 3, 4, 5
D) 3, 4
E) 1, 2, 3, 4, 5

Question

Quizplus · Accepted Answer

Hydrogen is unique because it doesn't fit neatly into any group, its electron is not shielded, it's the lightest element, and it shares properties with both alkali metals (group 1A) and halogens (group 7A).

Hydrogen Is Unique Among the Elements Because _