Why is lithium nucleus less stable than helium nucleus. What accounts for its lower B.E. per nucleon?

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$E l e c t r o n i c c o n f i g u r a t i o n o f l i t h i u m i s = 1 s^{2} 2 s^{1} E l e c t r o n i c c o n f i g u r a t i o n o f l i t h i u m i s = 1 s^{2} 2 s^{2} I f l i t h i u m w i l l l o s e t h e e l e c t r o n i t w i l l a q u i r e t h e n o b l e g a s c o n f i g u r a t i o n s o i t w i l l e a s i l y l o s e t h e e l e c t r o n . B u t t o i o n i s e h e l i u m e l e c t r o n h a s t o b e r e m o v e d f r o m t h e n o b l e g a s c o n f i g u r a t i o n . s o i t i s d i f f i c u l t t o r e m o v e R e g a r d s$

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