noble gas
Pronunciation
Noun
B2 Upper-intermediate
Quick answer
Any of a group of chemical elements, such as helium and neon, that rarely react with other elements because their outer electron shell is already full.
Test yourself
Which word fits the gap? "Neon signs glow because a _____ is excited by an electric current inside the tube."
Answer: noble gas
In your own words, what does "noble gas" mean?
Any of a group of chemical elements, such as helium and neon, that rarely react with other elements because their outer electron shell is already full.
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