Fig. 1.1 shows how first ionisation energies vary across Period 2. [Figure 1.1]

1. (a)Construct an equation to represent the first ionisation energy of oxygen. Include state symbols.[1]
2. (b)(i)State and explain the general trend in first ionisation energies across Period 2.[3]
3. (b)(ii)Explain why ionisation energy A in Fig. 1.1 does not follow the general trend in first ionisation energies across Period 2.[2]
4. (c)Element E is in Period 3 of the Periodic Table. The first eight ionisation energy values of E are shown in Table 1.1. Table 1.1 ionisation 1st 2nd 3rd 4th 5th 6th 7th 8th ionisation energy/kJmol⁻¹ 577 1820 2740 11600 14800 18400 23400 27500 Deduce the full electronic configuration of E. Explain your answer. full electronic configuration of E = explanation[3]

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