Answer:
40 (superscript) is the mass number aka atomic mass, and 19 (subscript) is the atomic number aka number of protons and electrons.
It’s B
Because that is the smallest way scientists divide plants your welcome
Carbon Monoxide is the correct answer
Reactants Hydrogen: 5
Products Hydrogen: 5
Reactants Carbon: 3
Products Carbon: 3
Reactants Oxygen: 4
Products Oxygen: 5