Question

Question 14 of 30

Which of the following elements has 1 valence electron?
The Periodic Table
A. Sodium (Na)
B. Chlorine (CI)
C. Calcium (Ca)
D. Helium (He)
SUBMIT

Answer 1

Na

Step-by-step explanation:

I was learning about it recently, that dude's right, it's Sodium

Answer 2

A. Sodium (Na)

Step-by-step explanation:

The total number of electrons in the outermost principal energy level of an element is called the valence electrons of that element.

Na (11)---→1s2 2s2 2p6 3s1

There 1 electron in the outermost principal energy level of Sodium. So, the number of valence electron of Sodium is 11.