Which set of elements will have similar reactivity?

Covalent network solids typically have melting points and boiling points. the chemical formula of a network solid indicates in the molecule.

2pos suppose an object in free fall is dropped from a building. its starting velocity is 0 m/s. ignoring the effects of air resistance, what is the speed (in m/s) of the object after falling 3 seconds? give your answer as a positive decimal without units. answer here

Which sample at stp has the same number of atoms as 18 liters of ne at stp