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Q.

What is the atomic number of Argon?

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a

17

b

16

c

18

d

19

answer is C.

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Detailed Solution

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The chemical element argon has the atomic number 18. 

The atomic number is defined as the total number of protons present in the nucleus of an atom. Argon has 18 protons in the nucleus and so the atomic number of  Argon is 18. Argon is represented by the symbol, Ar. It is a noble gas that belongs to group 18 of the periodic table. 

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