一第三週期元素之游離能依序為：$786{\text{kJ⋅mol}}^{-1}$, $1577{\text{kJ⋅mol}}^{-1}$, $3231{\text{kJ⋅mol}}^{-1}$, $4355{\text{kJ⋅mol}}^{-1}$, $16091{\text{kJ⋅mol}}^{-1}$, $19805{\text{kJ⋅mol}}^{-1}$。下列何者最可能為此一元素？