Each atom of protium has one proton, no neutrons, and one electron. each atom of deuterium has one proton, two neutrons, and one electron. are these the same or different elements? why? asap you guys!

Brainliesttt me asap! the below reaction can be categorized as more than one type of reaction. which reactions are these, and what are the types of reactions?

Which of the following represents the ester functional group? a. -coo- b. -cho c. -cooh d. c=o

Astable electron arrangement for an atom is one that does not easily change. how is this arrangement arrived at? a. valence electrons are transferred or shared to create a full outer shell of electrons. b. valence electrons are discarded into space to create a full outer shell of electrons. c. protons (positive charge) pair with valence electrons (negative charge) to create a strong bond. d. outer shells with valence electrons are transferred or shared.