Helium

How much of our universe is helium?

It makes up 35 percent.

Where was helium first discovered?

In the spectrum of the sun during an eclipse.

What color light does helium emit (produce) when its electrons are excited?

Yellow.

Where on earth is helium found?

It is a component of natural gas that comes out of gas fields.

How many electrons protons and neutrons does helium have?

two each

What is a helium atom without its electrons called?

Alpha radiation.

What is the relationship between a helium atom and radioactive elements such as Uranium(U) or Thorium(Th)?

When these elements undergo radioactive decay, they emit a helium nucleus

What is the most important use of helium nowadays?

Cooling superconducting metals down that can be used as super powerful magnets to look inside the human body for health purposes.

What is the name of a material that loses all its electrical resistance when exposed to liquid helium?

A superconductor.

What is a medical device that uses liquid helium?

Magnetic Resonance Imaging (MRI).