Chemistry
Grade-7
Easy
Question
Which noble gas has 18 protons?
Hint:
The atomic number is equal to the number of protons.
The correct answer is:
Argon is a chemical element with the symbol Ar and atomic number 18. It belongs to group 18 of the periodic table and is an inert gas. Argon is 0.934%, it is the third most abundant gas in the Earth's atmosphere. Its atomic number is 18 and therefore has 18 protons. Atomic mass is 39.948 u.
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