Can an element be broken down into a simpler substance? (T or F)
False
Elements are made up of atoms. An element cannot be broken down into a simpler substance.
100
Physical properties are ______________; they describe how a substance looks.
What is descriptors
100
Rows of elements are called ___________.
what is periods
100
What is the first element on the periodic table?
What is Hydrogen
200
Atoms are bigger than neutrons. (T or F)
True
200
A compound is a substance made up of two or more _______.
Elements
200
Physical properties can be observed and/or measured without changing the substance's _____________.
What is composition
200
Columns of elements help define element ________.
What is groups
200
What orbits the nucleus of an atom?
What is Electrons
300
__________ particles are found inside atoms.
Subatomic
300
A __________ is two or more substances combined.
What is mixture
300
Iron and oxygen form rust are classified as a ___________ reaction.
What is chemical
300
The group number indicates number of _________ electrons.
What is valence
300
At room temperature, what is the only metal that is in liquid form?
What is Mercury
400
_________ is a collective name for two particles, the neutron and proton.
Nucleon
400
Alcohol is a __________.
What is compound
400
Iron is more dense than aluminum is classified as a ________ reaction.
What is physical
400
The period number indicates the ___________ of the valence electrons.
What is energy level
400
What is the name given to substances that are initially involved in a chemical reaction?
What is reactants
500
__________ have no negative charge.
Neutrons
500
Are there more compounds or more elements?
There are more compounds
500
Mercury melts at -39 degrees celsius is a __________ reaction.
What is physical
500
Each square on the periodic table gives information about an element. On many printed periodic tables you can find an ___________ , ___________ , and ___________.
What is element's symbol, atomic number, atomic weight
500
Atoms of the same chemical element that have different atomic mass are known as?