Which is a larger molecule, O3 or SeO2?

Larger molecule = larger molecular weight

Add up each atoms mass in the compound and the molecule with the higher molecular weight is larger

In this case SeO2 is much larger 114amu > 48amu

Explanation:

the number of protons in the nucleus of a given element. has slight luster and conducts electricity at high temperatures like metal.but like a nonmetal,boron is brittle and does not conduct electricity well at low temperatures. in graphite, carbon is a soft,brittle solid.it is reflective,ductile,or malleable.