I think it would be water but im not sure! Hope that helps!!
<span>Isotopes are atoms of a particular element that contain a different number of neutrons.
An atom or element have same number of protons and electrons, but when there is a change in number of neutrons, this is called isotope of that element. There are many elements that have their isotopes like carbon have three isotopes Carbon 12, 13 and 14.</span>
B is the answer I think hope this helps
Answer:
i think it is all atoms of all elements are exactly alike and have the same mass
Explanation:
