This is the definition of an element.
What is the building blocks of matter? What are the simplest substances?
These are the first four elements.

What is hydrogen, and helium, lithium, beryllium?
This is why you can you see flames even when hydrogen burns invisibly.
What is hydrogen burns invisibly when it is the only thing burning?
This word means 'to add water to'.
What is hydrate?
This is the capital of France.
What is Paris?
The lines that run horizontally are called these two names.

What are periods and rows?
The periodic table has this many elements?
What is 118?
The name of the fiasco in 1937 was this.
What is the Hindenburg Disaster?
These are the dates of WWII.

What is 1939-1945?
This is the capital of Germany.
What is Berlin?
The lines that run vertically are called these two names.
What are columns or groups?
The H for hydrogen is called this.
![]()
What is an atomic symbol?
Jupiter is this much hydrogen and the sun is this much hydrogen.
What is 3/4ths and 4/5ths?
Airships were made by this company.
What is Zeppelin?
The NASA Kennedy Space Center is in this state.
What is Florida?
The periodic table structure that was decided upon, included these, differentiating from other periodic table structures.
What are missing elements?
This many elements occur in nature.
What is 92?
Hydrogen comes from these two Greek words meaning this.
The Toyota Mirai is this type of car.
What is a hydrogen fuel cell car?
These are two counties that surround the Black Sea.
What is Bulgaria, Romania, Ukraine, Russia, Georgia, and Turkey?
This man structured the periodic table as we know it today.
Who is Dmitri Mendeleev?
This is the smallest unit of an element.

What is an atom?
This is the term when a liquid unsaturated fat is turned into a solid fat using hydrogen, and trans fats are made.
What is hydrogenation?
These are the years of the American Revolutionary War.
What is 1775-1783?
These mountains separate Asian Siberia from European Russia. 
What are the Ural Mountains?