Which letter is not used as a symbol of a chemical element?
N
O
P
R
N is the chemical symbol of nitrogen, O - oxygen, P - phosphorus.
reach: rather globalchemical elementschemistry
Answers by country
N
O
P
R
answers

14

8344

32

569

42

25

186

14

57

36

75

21

459

228

60

32

33

18

20

68