It is the most common metalloid. Its symbol is Si.
Silicon.
100
This element is present in party balloons.
Helium.
100
This element is eighth most abundant element in the Earth's crust. This element is commonly found in caves and is flammable. Its symbol is Mg.
Magnesium.
100
This element is widely distributed in the Earth's crust and lithosphere, and it is found in almost all living things, rocks, water bodies, and soils. It is the twenty-second element on the Periodic Table.
Titanium.
100
You breathe this element.
Oxygen.
200
This element's Atomic Number is 33. Its symbol is As.
Arsenic.
200
This element is very common around the universe, but it is very rare on Earth. It is the tenth element on the Periodic Table.
Neon.
200
This element is a major material used in mineralization of bones and shells. This element is the most abundant metal by mass in many animals.
Calcium.
200
Pennies are made from this element.
Copper.
200
A water molecule contains one Oxygen atom and two ____ atoms.
Hydrogen.
300
It is the fifth element on the periodic Table.
Boron.
300
This element is the third most common gas in the Earth's atmosphere. It's even more common than Carbon Dioxide.
Argon.
300
It is the fourth element on the Periodic Table. Its symbol is Be.
Beryllium.
300
When this element is made into a coin, it is worth five cents.
Nickel.
300
In the human body this element is the second most abundant element by mass.
Carbon.
400
This element is chemically related to Sulfur. Its symbol is Te.
Tellurium.
400
This element is isolated by distilling liquified air.
Krypton.
400
This element readily oxidizes on exposure to air. Its symbol is Ra.
Radium.
400
People mine for this valuable element.
Gold.
400
This poisonous element looks like a yellow rock in its solid state.
Sulfur.
500
This element was named after the country, Germany.
Germanium.
500
This element is used in flash lamps and is the only element that starts with an "X".
Xenon.
500
This element was named after Strontian, a village in Scotland near which the mineral was first discovered.
Strontium.
500
This element's name is used in a Christmas song along with Gold (the answer is not Gold).
Silver.
500
This element is a colorless, odorless, tasteless and mostly inert diatomic gas at standard conditions, constituting 78.08% by volume of the Earth's atmosphere.