Which of the following atmospheric gases has not been represented by the correct symbol? Choose the most appropriate answer from the options given below:
1.Neon has the symbol Ne
2.Helium has the symbol He
3.Nitrous oxide has the symbol NO
4.Krypton has the symbol KR
A1 and 2
B2 and 3
C3 and 4
D1 and 4
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