Flashcards in Quiz 1 Deck (77)
Who discovered the electron? When?
JJ Thomas, 1897
What is matter?
Any substance that has mass and takes up space
What is an element?
The base units that all matter is made up of
How many elements are there?
What is an atom?
The smallest single unit of an element that retains that element's characteristics
What is a compound?
A substance that is comprised of two or more atoms; which are chemically combined.
What is a molecule?
The smallest single unit of a compound that retains that compounds characteristics.
What three subatomic parts are atoms made up of?
Protons, neutrons, electrons.
What charge do electrons have and where are they located?
Orbiting the nucleus, negative charge.
Where are protons located and what charge do they have?
Located in the nucleus and are positively charged
Where are neutrons located and what charge do they have?
Located in the nucleus, neutral charge.
What is the difference between each element?
The number of protons they have
What gives the atomic number and characteristics of an element?
The number of protons it has
How many electrons can fit in the first shell about the nucleus?
How many electrons can fit in the second shell around the nucleus?
How many electrons can fit in the third shell about the nucleus?
How many electrons can fit in the fourth shell about the nucleus?
What can be said about an atom that had the same number of protons and electrons?
It is balanced
When is an atom said to be stable?
When it will not readily react with another element
How is the stability of an element determined?
The number of electrons in the outermost shell.
If an atom has a positive charge, what is it known as?
If an atom has a negative charge what is it known as?
A negative ion
What is electricity?
The flow, or transfer of electrons.
What are the two types of electricity?
Current electricity, static electricity
What is conventional flow?
The orientation of electrons flowing from the positive to the negative
What is electron flow?
The orientation of electrons flowing from the negative to the positive
Which is the proper theory for electricity?
what is a conductor?
An element which will easily give up and receive electrons
What is an insulator?
An element which will not easily give up and receive electrons