1/20
N2
2/20
Br2
3/20
I2
4/20
C6H1206
Hint: 1 choice
5/20
H2
6/20
C12H22011
Hint: 1 choice
7/20
Cl2
9/20
O2
11/20
P4
12/20
C3H8
Hint: 1 choice
13/20
C2H5OH
Hint: 1 choice
15/20
H202
16/20
S8
17/20
CH3COOH
Hint: 1 choice
18/20
F2
19/20
CH3OH
Hint: 1 choice