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Periodic trends

AP.Chem: SAP‑1 (EU), SAP‑1.A (LO), SAP‑1.A.4 (EK), SAP‑2 (EU), SAP‑2.A (LO), SAP‑2.A.2 (EK), SAP‑2.A.3 (EK)
You might need: Periodic table

Problem

The first two ionization energies for beryllium are shown below.
Be(g)Be+(g)+eBe+(g)Be2+(g)+e  I1=900  kJ/molI2=1757  kJ/mol\begin{aligned} \begin{aligned} \text{Be}(g) &\rightarrow \text{Be}^{+}(g) + e^- \\\\ \text{Be}^{+}(g) &\rightarrow \text{Be}^{2+}(g) + e^- \end{aligned} & \begin{aligned} \;\quad I_1 &= 900\; \text{kJ/mol} \\\\ I_2 &= 1757\; \text{kJ/mol} \end{aligned} \end{aligned}
Which of the following identifies the most probable value for the third ionization energy for B, e and provides the best justification?
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