The number of protons per atom, and the number of electrons per atom.
Different Isotopes of the same element will each exhibit the same Chemical Characteristics.
The same numbers of protons and of electrons; the difference between isotopes is in the number of neutrons.
The number of protons is identical.
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 number of protons and electrons is the same.
They have the same numbers of electrons and protons.
They have the same number of protons and electrons.
The proton and electron number are equal for all isotopes of the same specific element.
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.
You have not told us what element "this" element is.