Question : Which chemical element from group 18 of the modern periodic table, whose atomic number is 10, contains a mixture of three stable isotopes commonly used to make signal and gas lasers and as refrigerators?
Option 1: Neon
Option 2: Oganesson
Option 3: Helium
Option 4: Radon
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Correct Answer: Neon
Solution : The correct answer is Neon.
Neon lies on the right side of the modern periodic table. It is a Noble gas from Group 18. Ne is the element symbol for Neon. Its atomic number is 10. Thus, there are ten protons and ten electrons in each atom of Neon. Neon has a mass number of 20 amu. Thus, there are ten neutrons in each neon atom.
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