What is the square root of 25? also, what does square root mean?

The square root of 25 is 5

The square root of something is what times the same number equals something. For example the square root of 25 is 5 because 5x5 = 25

The square root of 16 would be 4 because 4x4 = 16, and so on.

Square roots that don't equal a specific number are solvable, but that's a whole different lesson.

Hoped I was able to help :)

Element 17 is chlorine it is a group 7 element(halogen) and belongs to period 3 of the periodic table