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
Isotopes can be found in any element. A definitive statement on an isotope is ' An Atom has a different number of neutrons'. The element that exhibits in large proportion two isotopes is chlorine. There is Chlorine-35 & Chlorine-37 The numbers being the atomic masses of of chlorine. The difference of '2' ( 37-35) is made up by a different number of neutrons. Chlorine-35 ; 17 protons, 18 neutrons and 17 electrons Chlorine-37 ; 17 protons. 20 neutrons and 17 electrons. The atomic Mass of Chlorine is given as 35.5 . This because there are 75% of Cl-35 atoms and 25% of Cl-37 atoms. NB Not all isotopes are Radio-Active, but some are!!!!!
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.