Which of the following atmospheric gases has not been represented by correct symbol?

(A) Neon - Ne

(B) Helium - He

(C) Nitrous oxide - NO

(D) Krypton - KR

Choose the most appropriate answer from the options given below:

1
(A) and (B) only
2
(B) and (C) only
3
(C) and (D) only
4
(A) and (D) only

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