The halogens, alkali metals, and alkaline earth metals have ________ valence electrons, respectively.
A) 7, 4, and 6
B) 1, 5, and 7
C) 8, 2, and 3
D) 7, 1, and 2
E) 2, 7, and 4
Question 2
Of the noble gases, ________ is present in highest concentration in dry air at sea level.
A) Ne
B) He
C) Xe
D) Kr
E) Ar
