Which sample is a pure substance a. a test tub of zinc oxide
b. a container of zinc and oxygen
c. A flask of Pondwater
d. A jar of soil

neutrons are in the middle of the atom and the electrons, which are much smaller.

why do the isotopes of a particular element behave differently in nuclear reactions but the same in chemical reactions? chemical reactions involve changes to electrons in an atom; isotopes do not differ in electrons, and so they react the same way during chemical changes.

i think it's c. i'm not sure but i think so.

i think its 5049.

i hope this !