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Answers:-

1) Al (Aluminium)

2) C-13 (Carbon-13; an isotope of carbon)

3) let me guess

The chemical symbols for three different atomic cations that all have 13 protons:-

[tex]Al^{+1} ,Al^{+2} ,Al^{+3} [/tex]

Atomic number:-

The atomic number defines the number of protons in an atom.

Atomic cations are [tex]Al^{+1} ,Al^{+2} ,Al^{+3} [/tex]

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