If I interpret your question correctly, C is the element Carbon. When followed by a plus (in speaking) or a plus symbol it means it has a charge of one unit (elementary charge - charge on one electron). Because Carbon is defined as an atom with 6 protons, this means the Carbon in question must have 5 electrons. Thus it is an ion.
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The equilibrium constant ( K_b ) for the reaction of pyridine (C₅H₅N) with water to form pyridinium ion (C₅H₅NH⁺) and hydroxide ion (OH⁻) can be derived from the relationship between the ( K_a ) of the conjugate acid (C₅H₅NH⁺) and the ion product of water ( K_w ). It is given by the formula ( K_b = \frac{K_w}{K_a} ). Since ( K_a ) can vary based on temperature and concentration, you would need the specific ( K_a ) value for C₅H₅NH⁺ to calculate ( K_b ).
The name of the Mn2+ ion is manganese(II) ion.
Cu+
Ion C. Brătianu died on 1891-05-16.
Ion C. Brătianu was born on 1821-06-02.
Ion I. C. Brătianu died on 1927-11-24.
Ion I. C. Brătianu was born on 1864-08-20.
Ion C. Câmpineanu was born on 1841-10-10.
Ion C. Câmpineanu died on 1888-11-13.
b+b+b+c+c+c+c =3b+4c
c + c + 2c + c + c = 6c