Unit 1: Atomic Structure Flashcards
How many valence electrons are generally contained in materials used for insulators?
7-8
State the law of charges.
Opposite charges attract and like charges repel.
How many times smaller is an electron than a proton?
An electron is approximately 1000 times smaller than a proton.
It is theorized that protons and neutrons are actually formed from a combination of smaller particles. What are these particles called?
Quarks
What are the three principal parts of an atom, and what charge does each carry?
The three principal parts of an atom are the proton, the electron, and the neutron. The proton has a positive charge, the electron a negative charge, and the neutron no charge.
What is electricity?
The movement of electrons is what we think of as electricity.
The Greeks called amber elektron. The word electric was derived from it and meant “to be like amber,” or to have the ability to attract other objects.
What is a gluon?
In 1947, the Japanese physicist Hideki Yukawa identified a subatomic particle that acts as a mediator to hold the nucleus together. The particle is a quark known as a gluon.
How many times more does a proton weigh than an electron?
The latest scientific measurements suggest protons and neutrons weigh about 1838 times more than the electron.
How many valence electrons are generally contained in materials used for conductors?
1-3
How many valence electrons are generally contained in materials used for semiconductors?
4-6
