TEST QUESTION PLS HELP What are isotopes? Write isotopes of three different elements, showing their atomic number and mass number. (I'll give brainliest)

Isotopes are members of a family of an element that all have the same number of protons but different numbers of neutrons. The number of protons in a nucleus determines the element's atomic number on the Periodic Table

Explanation:

Hope this helps some? :)

the correct answer would be b. amelia, because the particals of gas move really fast (charged particals) and gas also has a lot of room (particals move independently) so the only answer that has both of those is amelia's.