This number equals the number of protons in the nucleus.
What is the atomic number?
100
The group does not usually form chemical bonds because they have full outermost energy levels.
What are the noble gases?
100
The equation to find the density of an object.
What is Density = mass / volume?
100
This type of combination of elements occurs when the properties of magnesium oxide are different than the individual properties of magnesium and oxygen.
What is a compound?
200
This the dense, positively charged portion of an atom.
What is the nucleus?
200
This describes how the properties of elements change periodically with the atomic numbers of the elements
What is the periodic law?
200
This is used to balance chemical equations.
What are coefficients?
200
A cork floats on water because it is____________ than the water.
What is less dense?
200
This is a pure substance that cannot be separated into simpler substances.
What is an element?
300
These have the same number of protons but different number of nuetrons.
What are isotopes?
300
These elements are found to the right of the zig-zag line.
What are nonmetals?
300
This element is representd by the C in the chemical formula CH4
What is Carbon?
300
If the density of water is 1 what would the density of the cork have to be?
What is less than 1?
300
This is a pure substance composed of two or more elements chemically combined,
What is a compound?
400
These are found farthest away from the center of an atom.
What are electrons?
400
This class of elements best conducts electricity.
What are the metals?
400
An equation that shows the total mass during a chemical reaction stays the same.
What is a balanced equation?
400
Calculate the density when the mass is 24g and the volume is 100mL
What is .24 g/mL
400
This can be represented by a pizza or salt water.
What is a mixture?
500
This is made up of a core of protons and nuetrons surrounded by electrons.
What is an atom?
500
This category of elements has a greater conductivity and higher melting point than nonmetals.
What are the metals?
500
The type of energy released or absorbed in most chemical reactions.
What is heat energy?
500
.24 g/mL is ____________ 1
What is less than
500
You can not see the components of this mixture, such as salt water.