The diagram shows four locations in the electric field of a positive point charge. At which point is the electric potential the greatest?
W
X
Y
Z

1. how to locate the image in converging(concave) mirror and diverging (convex) mirror with salt. 2. how to locate the image in a converging (convex) lens and diverging (concave) lens with salt.

What happens when the number of protons in an atom changes

Explain the difference in reactivity of the elements based on their electron configurations.