Edexcel Jun 2013 (R) Paper 1 Q21

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SECTION B Answer ALL the questions. Write your answers in the spaces provided. 21 In atoms, electrons fill up the sub-shells in order of increasing energy. (a) Fill in the last two boxes in the table below to show the order in which the next two sub-shells are filled. 1s 2s 2p 3s 3p 4s energy increases o (b) Electrons in atoms occupy orbitals. (i) Explain the term orbital. (2) (1)(ii) Draw diagrams below to show the shape of an s-orbital and of a p -orbital. s-orbital p-orbital (c) State the total number of electrons occupying all the p-orbitals in one atom of chlorine. (2) (1)(d) State the number of electrons present in an ion of calcium, Ca2+. (1)10 *P42982A01024*<br /> *(e) Define the term first ionization energy. (3)(f) The ionization energies of sodium, Na, are shown in the table below. Show with a tick (9), in the third row of the table below, all the ionization numbers that involve the removal of an electron from an s-orbital. (2) Ionization energy / kJ mol1 Ionization number 496 4563 6913 9544 13352 16611 20115 25491 28934 141367 159079 1st 2nd 3rd 4th 5th 6th 7th 8th 9th 10th 11th (Total for Question 21 = 12 marks) *P42982A01124* 11 Turn over<br />

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