The original amount of radioactive substance is 10 grams. after several years, 2.5 gtams of the substance is remaining. how many half-lives havr passed since the mass of the subtance was 10 grams?

Describing intermolecular forces use the drop down menus to match the type of intermolecular force to its name dipole dipole interactions dipole induced dipole interactions london dispersion forces hydrogen bond van der waals forces done

To apply in a gold the individual gold atoms are united to each other by means of a metallic bond. how would you use the gold block to determine the atomic radius of a gold atom?

Which scientists contributed to the determination of how cfcs in clouds in the upper atmosphere could destroy ozone molecules