- Created by: ABizz
- Created on: 30-01-19 17:13
Inside the atom
Protons and neutrons make up the nucleus of an atom.
Electrons move about in the space around the nucleus.
A proton has a positive charge
An electron has a negative charge
A neutron has no charge
An uncharged atom has equal numbers of protons and electrons.
Adding electrons makes an atom negative
Losing electrons makes an atom positive
Charging by friction
When some insulators are rubbed together, the friction causes the electrons to be scraped off one insulator and transferred onto the other, giving one a positive charge and the other an equal negative charge
Rubbing a polythene rod with a dry cloth transfers electrons to the surface atoms of the rod from the cloth. The polythene rod becomes negatively charged