Melting points and boiling points are examples of a. Physical properties
b. Density
c. Chemical properties
d. Solubility

How many neutrons does a atom of cobalt have?

Which of the following has wavelength longer than the wavelength of viable light? a) x rays b) gamma rays c) radios waves d) ultraviolet waves

Answer explain why it is not possible to deduce a complete order of reactivity.