( ( Elements ( with ( ( the ( least tendency ) ) ( to ( form anions ) ) ) ) ) ( ( are ( those ( on ( ( the ( far left ) ) ( of ( the ( periodic table ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNS Elements)) (PP (IN with) (NP (NP (DT the) (JJS least) (NN tendency)) (PP (TO to) (NP (NN form) (NNS anions)))))) (VP (VBP are) (NP (NP (DT those)) (PP (IN on) (NP (NP (DT the) (ADJP (RB far) (VBN left))) (PP (IN of) (NP (DT the) (JJ periodic) (NN table))))))) (. .)))
Elements with the least tendency to form anions are those on the far left of the periodic table.
(ROOT (S (NP (DT A) (PRN (-LRB- -LRB-) (NP (NN n)) (-RRB- -RRB-)) (NN anion)) (VP (VBZ is) (VP (VBN formed) (SBAR (WHADVP (WRB when)) (S (NP (DT an) (NN element)) (VP (VBZ gains) (NP (QP (CD one) (CC or) (JJR more)) (NNS electrons))))))) (. .)))