Question

What does an electroscope do?

It adds electrons to an object
It detects negative static electricity when protons are drawn down into the
leaves of an electroscope, causing the leaves to repel one another and move
apart.
It calculates the amount of electrons in an object therefore knowing what kind of
element something is
Electroscopes do not exist, they are a Hollywood Sci-Fi creation

Answer 1

It detects negative static electricity when protons are drawn down into the

Step-by-step explanation:

electroscope, instrument for detecting the presence of an electric charge or of ionizing radiation, usually consisting of a pair of thin gold leaves suspended from an electrical conductor that leads to the outside of an insulating container.