They have less or more neutrons. Isotopes have same number of protons but different number of neutrons.
Hsuisiifi Sotheby’s udjhr
Answer:
Density
Explanation:
Density is defined as the mass per unit volume. It is the ratio between the mass and the volume of a substance. It does not matter how large or small a sample of matter is, the same substance will always have the same density, because of this. The ratio between the mass and volume remains the same.
