1
A chemical element with the symbol N and atomic number 7.
2
A chemical element with the symbol H and atomic number 1.
3
A chemical element with the symbol C and atomic number 6.
4
A chemical element with the symbol O and atomic number 8.
5
A chemical element with the symbol Fe and atomic number 26.
6
A chemical element with the symbol Na and atomic number 11.
7
A chemical element with the symbol He and atomic number 2.
8
A chemical element with the symbol Au and atomic number 79.
