Question

mass number → a (n of protons + n of neutrons)
x
element
atomic number → z (n of protons)
isotope: same number of ____ and __, different number of ____
ions: same number of ____ and __, different number of ____
table with columns: nuclear symbol for both isotopes, hyphen notation form

Explanation:

Step1: Recall Isotope Definition

Isotopes are atoms of the same element with the same number of protons (atomic number) and electrons (in neutral state), but different number of neutrons. So for isotopes: same number of protons and electrons (in neutral), different neutrons.

Step2: Recall Ion Definition

Ions are atoms (or molecules) with a net charge, meaning same number of protons (to be same element) and neutrons (isotope aspect not for ion charge), but different number of electrons (lost or gained to form charge). So for ions: same number of protons and neutrons, different electrons.

Answer:

Isotope: Same number of $\boldsymbol{\text{protons}}$ and $\boldsymbol{\text{electrons}}$ (in neutral), different number of $\boldsymbol{\text{neutrons}}$.
Ions: Same number of $\boldsymbol{\text{protons}}$ and $\boldsymbol{\text{neutrons}}$, different number of $\boldsymbol{\text{electrons}}$.

(Note: For isotopes, in neutral atoms, electrons = protons; for ions, electrons differ from protons. The blanks likely expect:
Isotope: protons, electrons (or protons, protons? Wait, no—atomic number is protons. Isotopes: same atomic number (protons), same element (so same protons), same electrons in neutral. Different neutrons.
Ions: same protons (same element), same neutrons (if isotope, but ion is about charge), different electrons. So correct blanks:

Isotope: protons, electrons (or protons, protons? No, atomic number is protons. So "protons" (atomic number) and "electrons" (in neutral) – but maybe simpler: protons, electrons (no, in neutral, electrons = protons. Wait, standard definition: Isotopes have same number of protons (and electrons in neutral), different neutrons.
Ions: same number of protons (same element) and neutrons (if considering same isotope ion), different electrons.

So filling the blanks:

Isotope: Same number of $\boldsymbol{\text{protons}}$ and $\boldsymbol{\text{electrons}}$ (or just protons, as electrons in neutral equal protons), different number of $\boldsymbol{\text{neutrons}}$.
Ions: Same number of $\boldsymbol{\text{protons}}$ and $\boldsymbol{\text{neutrons}}$, different number of $\boldsymbol{\text{electrons}}$.

But more accurately, for isotopes: same number of protons (atomic number) and electrons (in neutral atom), different number of neutrons.
For ions: same number of protons (to be same element) and neutrons (if same isotope), different number of electrons (lost/gained for charge).)

Final answer for blanks (most standard):
Isotope: protons, electrons, neutrons
Ions: protons, neutrons, electrons

(Wait, no—ions can have same or different neutrons? No, ion is about charge (electrons), isotope is about neutrons. So for ions, same protons (same element), same neutrons (if same isotope), different electrons. So the blanks:

Isotope: Same number of $\boldsymbol{\text{protons}}$ and $\boldsymbol{\text{electrons}}$ (in neutral), different number of $\boldsymbol{\text{neutrons}}$.
Ions: Same number of $\boldsymbol{\text{protons}}$ and $\boldsymbol{\text{neutrons}}$, different number of $\boldsymbol{\text{electrons}}$.

But the first two blanks for isotope: protons (atomic number) and electrons (in neutral) – but maybe the question considers neutral atoms, so electrons = protons. So "protons" and "electrons" (or "protons" and "protons" – no, atomic number is protons. So correct:

Isotope: protons, electrons, neutrons
Ions: protons, neutrons, electrons

Yes, that's the standard. So:

Isotope: Same number of $\boldsymbol{\text{protons}}$ and $\boldsymbol{\text{electrons}}$, different number of $\boldsymbol{\text{neutrons}}$.
Ions: Same number of $\boldsymbol{\text{protons}}$ and $\boldsymbol{\text{neutrons}}$, different number of $\boldsymbol{\text{electrons}}$.

(Note: For ions, neutrons can be same (if same isotope) or different (if different isotopes), but the key is charge from electrons. The question likely simplifies: ions have same protons (same element) and neutrons (same isotope), different electrons. So the blanks are:

Isotope: protons, electrons, neutrons
Ions: protons, neutrons, electrons)