Acertain atom of oxygen contains 8 protons, 8 neutrons, and 8 electrons. another atom of unknown identity contains 9 protons. which of the following must be true about this unidentified atom?
a. it is an isotope of oxygen
b. its atomic mass is a decimal number
c. it has 9 neutrons in its nucleus
d. it cannot be an atom of oxygen

2. cheryl hears a new song on the radio every day during the week on her commute to work. surprisingly, when the song comes on at a party on saturday night, she knows most of the words without trying. describe the three ways that we use cognition to learn without reinforcement. which type of cognitive learning without reinforcement best explains how cheryl knew the song lyrics? explain your answer.