Question

question 9 (10 points)
each group a number (1a, 2a, 3a, 4a, 5a, 6a, 7a, and 8a) of the elements in the periodic table generally corresponds to

a an orbital.
b an atomic mass.
c a valence electron
d a principle energy level.

Explanation:

In the periodic table, for main - group (Group A) elements, the group number (1A - 8A) generally corresponds to the number of valence electrons. For example, Group 1A elements (e.g., Li, Na, K) have 1 valence electron, Group 2A elements (e.g., Be, Mg, Ca) have 2 valence electrons, and so on. An orbital is a region of space where an electron is likely to be found. Atomic mass is the mass of an atom. The principal energy level is related to the period number (rows in the periodic table), not the group number.

Answer:

c. a valence electron