Examlex
Which of the following statements is true?
Helium
A chemical element with symbol He and atomic number 2, known for being a lightweight, inert gas widely used in balloons and as a coolant.
Neon
A chemical element with the symbol Ne and atomic number 10, it is a colorless, odorless, inert monatomic gas under standard conditions, with about two-thirds the density of air and is used in fluorescent lamps and signs.
Argon
A noble gas element with the atomic number 18, colorless, odorless, and inert, making up about 1% of the Earth's atmosphere.
React
To react means to respond to a stimulus or to undergo a chemical change.
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