Unit 1: Atomic Theory Flashcards
What is AC and DC?
Alternating Current(bidirectional) and Direct Current (unidirectional)
What is the basic building block of the universe and the smallest part of an element?
The atom
Matter is a combination of atoms. True or False?
True
What are the 3 states that matter can exist?
Solid, Liquid or Gas
An element is a substance that cannot be divided into two or more simpler substances. True or False?
True
What are the tree principal parts of a atom?
Proton, Neutron and Electron
What is the nucleus of an atom made of?
Protons and Neutrons
The atomic number of an element is the same number of protons in its nucleus.
True or False?
True
What happens if two objects if likely forces come close to each other?
The will repel each other
What happens if two objects if unlikely forces come close to each other?
They will attract each other
How many electrons can the fourth shell hold max?
32
How many electrons can the 1, 2 and 3 shell hold max?
1= 2, 2= 8 and 3= 18
What do we call the electrons located at the valence shell?
Valence Electrons
Atoms with up to 3 valence electrons are considered really good conductors, true or false?
True
How many electrons can the valence shell hold?
8 max
What is electricity?
Electricity is the flow of electrons
How does current flow is produced? Witch theory states that?
The bump theory, the electrons produce current flow when they kick each other out of the atom’s valence shell.
Are materials that are neither good conductors nor good insulators. They usually have 4 electrons in the valence shell. The conductivity changes based on the temperature, when it is very hot
Semiconductors
What a molecule is?
Is the smallest part of a compound
What are insulators?
Materials that provides a really difficult path for the current to flow
How many valence electrons do insulators usually have?
7-8 valence electrons
Six basic methods for producing electricity are magnetism, chemical action, light, heat, pressure,
and friction. True or False?
True
Five basic effects that can be caused by electricity are magnetism, chemical reactions, light, heat,
and pressure. True or False?
True
