Answer:
Step-by-step explanation
a. chlorine as it has 17 electrons arranged in three quantum shells.
b. thallium
c. sodium
d. fluorine
e. zinc
f. iron
g. calcium
h. silicon
I. indium
j. selenium
k. lithium
hint: the number of valence electrons depend on the group in which an element is in.
ans energy level depend upon the period in which the element is in.