Isotopes are forms of the same element that differ in Neutrons.
element vs isotopes
When two elements have the same atomic number, it means they are isotopes of each other. Isotopes have the same number of protons but different numbers of neutrons in their nuclei. This results in subtle differences in their atomic mass and stability.
Isotopes are atoms of the same elements with different number of neutrons.
Isotopes of elements are atoms with the same number of protons but different numbers of neutrons. This causes isotopes of the same element to have different atomic masses. Isotopes can be stable or unstable, with unstable isotopes undergoing radioactive decay.
Isotopes of potassium, like other isotopes of elements, have the same chemical properties because they have the same electron configuration. Consequently, their boiling and melting points are essentially identical. However, slight differences may arise due to variations in mass, but these differences are typically negligible and do not significantly affect the physical properties. Therefore, for practical purposes, potassium isotopes can be considered to have the same boiling and melting points.
Since you have isotopes of elements. Isotopes are elements with different number of neutrons hence why the different atomic masses for the same elements.
The isotopes of the same element have an identical number of protons and electrons; the number of neutrons is different.
Neutrons
neutrons
elements are isotopes, when different atoms of the same element have different number of neutrons
All the isotopes of a chemical element are identical; some differences exist for light elements (ex. H or D).
The answer you are looking for is "isotopes" HOWEVER, please note you CAN NOT HAVE 2 elements with the same number of PROTONS. This is because the number of protons DEFINES an element. Isotopes are the SAME element but with differing numbers of neutrons.