Lesson 1- What Is Electricity? Flashcards
(24 cards)
Matter is the material from which all known invisible objects are made.
TRUE
Which of the following is a common form of matter?
Gas, Liquid, Solid
The simplest form of any matter is called a _____?
Element
A ______ is the smallest particle to which an element can be reduced yet still retain the characteristics of that element
Atom
Which of the following is not one of the three main parts of an atom?
Quarks
What are two parts that make up the nucleus of an atom?
Neutrons and Protons
Smaller sub particles of the proton and neutron are called?
Quarks
Which particle as a negative charge and rotates around the outside of the nucleus of the atom?
Electron
The charge of the nucleus of any atom is always ____?
Positive
The quantity of protons in an element can be identified by the elements _____?
Atomic Number
The proton has a mass that is over ____ times greater than the mass of the electron.
1,836
As electrons rotate about the nucleus, ______ tries to cause them to fly off into space.
Centrifugal force
Centrifugal force tries to pull the electrons away from the nucleus and exactly balances the force trying to pull them toward the nucleus.
True
How many electrons are pressed in a copper atom?
29
How many valence electrons are there for a copper atom?
1
Like charges attract each other.
False
Unlike charges repel each other.
False
+ <— —> +
- <— —> -
+ —> -
Protons repel each other
Electrons repel each other
Electrons and protons attract each other.
Electrons revolve around the nucleus in paths called orbital rings or shells.
True
Valence electrons are those atomic particles in the ______ orbit, or shell of atoms.
Outermost
Materials with a partially filled valence ring are set to be chemically stable
False
How many valence electrons does a conductor generally have?
1 or 2
How many valence electrons does an insulator generally have?
7 or 8
Semi conductors have ______ electrons in the valence shell.
4
