Give the structures of (a) B₇H^2-₇; (b) B₅H^4-₅

(a) Structure of \( B_7H_7^{2-} \):  
The boron hydride ion \( B_7H_7^{2-} \) belongs to the class of boranes known as closo-boranes. It follows Wade’s rules, which predict that a closo structure has (n+1) pairs of skeletal electrons __________ __________ _______ ____ _____ ____.
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