IB PERIODICITY TESTBANK SOLUTIONS - short answer

IB PERIODICITY TESTBANK SOLUTIONS - short answer - IB...

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IB PERIODICITY TESTBANK SOLUTIONS – SHORT ANSWER 2. 5. 8.
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9.
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10. 13.
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14. ligand: a molecule or ion that can bond to a (central) metal ion (to form a complex); NH 3 : Lewis base and Cu 2+ : Lewis acid ( need both for mark ); each NH 3 / ligand donates an electron pair (to Cu 2+ ); forming coordinate covalent / dative covalent bond; 4 [4] 21. (i) period is a horizontal row in the periodic table and a group is a vertical column / OWTTE ; 1 (ii) 2,5; electrons in two energy levels / shells; five outer / valence electrons; 3 [4] 22. (i) atomic radius of N > O because O has greater nuclear charge; greater attraction for the outer electrons / OWTTE ; 2 (ii) atomic radius of P > N because P has outer electrons in an energy level further from the nucleus / OWTTE ; 1 (iii) N 3− >N / ionic radius > atomic radius because N 3− has more electrons than protons; so the electrons are held less tightly / OWTTE ; 2 Award [1] for greater repulsion in N 3− due to more electrons (no reference to protons). [5]
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23. (a) scandium and zinc / Sc and Zn; 1 Both needed for the mark. Accept copper/Cu if given in addition to Sc and Zn i.e. all three needed for the mark. (b)
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IB PERIODICITY TESTBANK SOLUTIONS - short answer - IB...

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