The atomic number of an element is determined by each atom's number of 1 nucleons
2 electrons
3 protons
4 neutrons

Which would be the most useful source of evidence to support mcneill's contention?

Hector is back from his morning run and is feeling light-headed because his energy is depleted which food item will provide him with a quick source of carbohydrates

This is collection of data made by comparing objects in standard units. in science, the units are metric.