What is the smallest particle of an element?

Ineed with a, b, c, d, and e on the long answer

Which of these sequences lists the correct order for the creation of sedimentary rock from sediment? a. deposition, burial, compaction, cementation b. burial, deposition, compaction, cementation c. compaction, deposition, burial, cementation d. cementation, deposition, burial, compaction

How will the emission of an alpha particle affect the atomic number of an atom