In the expression \( 7 + n + k \), the terms are \( 7 \), \( n \), and \( k \). The second term here is \( n \).
The coefficient of a term is the numerical factor that multiplies the variable in that term. In the case of \( n \), it is understood to have a coefficient of 1 (as in \( 1n \)).
Therefore, the coefficient of the second term \( n \) is \( \boxed{1} \).
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