Below is a representation of a sample of gas with molecules having the formula XO2.Which element could NOT be represented by X? 
Definitions:
Blood Pressure
The force that circulating blood exerts against the walls of the arteries.
Testicular Cancer
is a type of cancer that originates in the testicles (testes), the male reproductive glands located in the scrotum.
Epididymis
The coiled tube, formed by the merging of the seminiferous tubules, where sperm mature.
Testicular Self-Exam
A self-conducted procedure by which an individual examines their own testicles to check for signs of testicular cancer or other anomalies.
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