Created by StemPy LabThe first ionisation enthalpies of the eight elements of one short period are listed in order of increasing atomic number, using the letters A to H. The values in are: A 496, B 738, C 577, D 786, E 1000, F 1012, G 1251, H 1521. When the table was copied, the values of exactly one pair of elements were interchanged. Every other value is correct. Which statement fits the data?
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← Consider the six ions N³⁻, O²⁻, F⁻, Na⁺, Mg²⁺ and Cl⁻ as they occur in ionic crystals. Five of these ions have the same number of electrons, but one does not. Use the nuclear charge acting on a fixed electron cloud and the number of occupied shells to decide the sizes. Which is the correct order of increasing ionic radius?The first five ionisation enthalpies of an element X, which lies in period 3, are: Δi H₁ = 578 kJ mol⁻¹, Δi H₂ = 1817 kJ mol⁻¹, Δi H₃ = 2745 kJ mol⁻¹, Δi H₄ = 11577 kJ mol⁻¹, Δi H₅ = 14842 kJ mol⁻¹. X forms an oxide in which it shows its group oxidation state. Which statement about the formula and the acid-base behaviour of this oxide is correct? →
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