Question

which two chemists organized elements based on properties such as how the elements react or whether they are solid or liquid?

lavoisier and mendeleev
dobereiner and newlands
newlands and mendeleev
lavoisier and dobereiner

Explanation:

To solve this, we recall the work of chemists in organizing elements. Lavoisier classified elements into metals, non - metals, etc., and also considered states (solid/liquid/gas) and reactivity. Newlands (with his law of octaves) also worked on organizing elements based on properties. Dobereiner's work was on triads, and Mendeleev focused on atomic mass and periodicity (not mainly state/reactivity for organization as per the question's context). So the pair Lavoisier and Newlands is correct as they organized elements considering properties like reactivity and state.

Answer:

Lavoisier and Newlands (the option "Lavoisier and Newlands")