Slide 6 Slide 7 Slide 8 Electrical Charges Charges of the same polarity tend to repel one another. Charges of opposite polarity tend to attract one another.
Electrons tend to move toward protons because electrons have far less mass than protons.
The atomic number of an element is the number of protons in the nucleus of its atom. The number of electrons in orbit around the nucleus of a neutral atom is equal to the number of protons in the nucleus. The valence of an element is the number of electrons in the outermost orbit. An electric circuit is a closed path for electron flow. Potential difference must be applied to a circuit to produce electron current flow.