Please enter your email: 1.Why is the first ionisation energy of phosphorus greater than the first ionisation energy of silicon? A. A phosphorus atom has one more proton in its nucleus. B. The atomic radius of a phosphorus atom is greater. C. The outer electron in a phosphorus atom is more shielded. D. The outer electron in a phosphorus atom is paired. 2. Equations involving four enthalpy changes are shown. Na(g) → Na+(g) + e– ΔH = W Na(g) → Na2+(g) + 2e– ΔH = X Na(s) → Na(g) ΔH = Y Na(s) → Na2+(g) + 2e– ΔH = Z What is the second ionisation energy of sodium? A. 2W B. X – W C. Y – W D. Z – Y 3.Alloys are usually harder than the metals from which they are made.Which difference between the metals explains the greater hardness of alloys? A. atomic radius B. boiling point C. density D. malleability 4.Which graph shows the number of electrons in the outer shell of an atom, plotted against the proton (atomic) number for the first ten elements in the Periodic Table? A B C D 5. Element X is in group 2, and element Y in group 7, of the periodic table. Which ions will be present in the compound formed when X and Y react together? A. X+ and Y- B. X 2+ and Y- C. X+ and Y 2- D. X 2- and Y+ 6.Which of the following properties of the halogens increase from F to I? Atomic radius Melting point 3. Electronegativity A. I only B. I and II only C. I and III only D. I, II and III 7.Which pair would react together most vigorously? A. Li and Cl2 B. Li and Br2 C. K and Cl2 D. K and Br2 8.Which factor helps to explain why the first ionisation energies of the Group I elements decrease from lithium to sodium to potassium to rubidium? A. The nuclear charge of the elements increases. B. The outer electron is in an ‘s’ subshell. C. The repulsion between spin-paired electrons increases. D. The shielding effect of the inner shells increases. 9.In the diagrams, circles of different sizes represent atoms of different elements. Which diagram can represent hydrogen chloride gas? A B C D 10. The diagram shows the electronic structures of atoms P and Q. P and Q combine to form a molecule.What is the formula of this molecule? A. PQ4 B. PQ C. P2Q D. P4Q Loading … Question 1 of 10
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