( ( ( ( ( Lithium ( has ( three electrons ) ) ) , ) so ) ( ( ( the ( quantum numbers ) ) ( for ( two ( of them ) ) ) ) ( ( are ( ( the same ) as ) ) ( for ( ( the ( two electrons ) ) ( of helium ) ) ) ) ) ) . )
(ROOT (S (S (NP (NNP Lithium)) (VP (VBZ has) (NP (CD three) (NNS electrons)))) (, ,) (IN so) (S (NP (NP (DT the) (NN quantum) (NNS numbers)) (PP (IN for) (NP (NP (CD two)) (PP (IN of) (NP (PRP them)))))) (VP (VBP are) (ADVP (NP (DT the) (JJ same)) (RB as)) (PP (IN for) (NP (NP (DT the) (CD two) (NNS electrons)) (PP (IN of) (NP (NNP helium))))))) (. .)))
Lithium has three electrons, so the quantum numbers for two of them are the same as for the two electrons of helium.
(ROOT (S (NP (NNP Lithium)) (VP (VBZ has) (NP (CD three) (NNS electrons))) (. .)))