Asample of radium-226 contains 1.0×108 atoms of radium-226. how many atoms of radium-226 will remain in the sample after three half-lives?

What is the study of how matter and energy interact? a. biology b. physics c. planetary science d. chemistry

Use the table to identify the phase and phase changes of the elements under the given conditions. write the name of the substance, phase, or phase change

Consider the directing effects of the substituents on salicylamide and predict the possible structures of the iodination products. which do you think will be the major product?