Guided science

Inside an atomFrom one atom to the periodic tableFrom atoms to moleculesFrom moles to reactionsEnergy, entropy and changeNuclei, isotopes and timeLight, waves and atomsMeasurement is part of science

Mendeleev explains

Start from what you can observe, then connect it to the model scientists use.

Try this

Look for one measurable consequence: a colour change, a temperature change, a spectrum, a pressure, a mass or a time.

Common trap

A model is useful because it explains and predicts. It is not a literal photograph of nature.