They have the same number of protons in the nucleus and same number of electrons surrounding the nucleus.
Different Isotopes of the same element will each exhibit the same Chemical Characteristics.
The number of protons and electrons is the same.
Two different neutral isotopes of the same element have the same number of protons in their nucleus, which determines the element's identity. The isotopes differ in the number of neutrons they have, which leads to variations in atomic mass but not in chemical properties.
The atomic number is the same for all isotopes.
They have the same number of protons in the nucleus and same number of electrons surrounding the nucleus.
The proton and electron number are equal for all isotopes of the same specific element.
Different Isotopes of the same element will each exhibit the same Chemical Characteristics.
The number of protons and electrons is the same.
They have the same number of protons and electrons.
Two different neutral isotopes of the same element have the same number of protons in their nucleus, which determines the element's identity. The isotopes differ in the number of neutrons they have, which leads to variations in atomic mass but not in chemical properties.
The atomic number is the same for all isotopes.
They have the same number of protons in the nucleus and same number of electrons surrounding the nucleus.
They have the same number of protons in the nucleus and same number of electrons surrounding the nucleus.
The same numbers of protons and of electrons; the difference between isotopes is in the number of neutrons.
The number of protons is identical.
Not all of the transition elements are radioactive. Many of them are, and some of them have common radioactive isotopes, but some of them have no naturally occurring radioactive isotopes. Please note that all elements have synthetic radioactive isotopes, at least.
Because the isotopes do not appear in equal amounts. This is hardly surprising since many isotopes experience radioactive decay and change to other elements after decay while stable isotopes persist - thus stable isotopes will usually dominate as the most common isotopes for individual elements with those with the longest half-lifes being more common than those with shorter half-lifes. Of course when you get into the heaviest elements there don't seem to be any stable isotopes so those with longest half life dominate.