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Why is helium called a noble gas?

“Helium is a noble gas, which means it almost never reacts with other elements.”

Reference: Royal Society of Chemistry

What saturation of sulfur dioxide will cause people to cough

Sulfur dioxide is a colorless gas with a suffocating, choking odor. It is toxic to humans and concentrations as low as 8 ppm will produce coughing. Incredibly, in the Odyssey, Homer describes the burning of sulfur (formation of SO2) as a way that homes were 'fumigated'.

Where was helium first discovered?

Helium was discovered in the Sun's light in 1868, decades before it was found on Earth.

Who created the periodic table of elements?

Russian chemist Dmitri Mendeleev published his periodic table in 1869. He left gaps for elements that had not been discovered yet and correctly predicted their properties.

Another fact

“Helium is a noble gas, which means it almost never reacts with other elements.”

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What saturation of sulfur dioxide will cause people to cough

Where was helium first discovered?

Who created the periodic table of elements?