Most solar cells rely upon the natural properties of element X. what is element X?

Question: NOTE: X HAS NOTHING TO DO WITH THE ELEMENTS NAME.

these are the elements to choose from:

Hydrogen
Titanium
Lithium
Tantalum
Beryllium
Tungsten
Sodium
Chromium
Magnesium
Uranium
Potassium
Californium
Calcium
Nickel
Barium
Copper
Francium
Zinc
Radium
Lead
Silver
Platinum
Gold
Mercury
Boron
Carbon
Nitrogen
Fluorine
Phosphorus
Sulfur
Chlorine
Arsenic
Selenium
Tin
Iodine

Answer:
The first PV cells relied on the photoreactive properties of silicon (Si), but the current research focuses in on GaAs and CuInSe2

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Is the name mostly contused? Read the text!! It has to be in there somewhere.

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Selenium

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