Answer:
An atom of sodium has 11 proton, 11 electrons, and 12 neutrons.
Answer:
The equation of the new line is 
Step-by-step explanation:
Reflecting a function over the x-axis:
Suppose we have a function y = f(x)
Suppose y' is the function y, reflected over the x-axis. Their relation is:
y' = -y
In this question:
Line with equation 
Reflection over the x-axis:
We have that:

The equation of the new line is 