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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