If a reaction appears to result in a change of mass, it is usually because a reactant or product that is a has not been taken into account. What word completes the sentence?

#20 which type of bond is formed when bases pair in dna? ionic bond covalent bond coordinate bond hydrogen bond

Assignment directions: pick one of the following chemists and perform a bit of research on him/her. answer the following questions. alice hamilton             rosalind franklin marie curie             gertrude b. elion ada yonath             henry cavendish robert boyle             antoine lavoisier mario j. molina             svante arrhenius

Using the periodic table complete the table to describe each atom type in your answers