Test 1 (2)
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Transition elements are elements whose atoms have incomplete d-shells or whose atoms can give rise to cations with incomplete d-shells. Copper is a transition element because its atoms have an incomplete d-shell, whereas scandium and zinc are not as their atoms have fully filled d-shells. Chromium has the electronic configuration [Ar] 3d5 4s1 which disobeys the Aufbau principle due to the relatively small energy difference between the 3d and 4s orbitals. Dichromate(VI) ion is a powerful oxidizing agent in acidic solution, is orange in color, and can oxidize iodide to iodine in an ion-electron reaction. Transition metals have
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![Test 1
1. a) Define transition element. [2m]
b) Explain why scandium and zinc are not considered as transition elements whereas
copper is one. [2m]
c) i. Write the electronic configuration of a chromium atom. [1m]
Ii. explain why this configuration disobey the Aufbau rule. [2m]
d) In acidic solution, the dichromate (VI) ion is a powerful oxidising agent.
i. What is the colour of the dichromate (VI) ion? [1m]
Ii.write an ion/electron equation to illustrate the oxidising property of the
dichromate (VI) ion. [2m]
2. How does the electronic configuration of a transition metal differs from the elements
in the main groups of the Periodic Table? You may use iron and calcium as examples.
[5m]
3. Give four characteric properties of transition elements or their compounds. Illustrate
your answer by reference to suitable examples. [8m]](https://image.slidesharecdn.com/test12-200421072233/85/Test-1-2-1-320.jpg)
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Test 1 (2)
- 1. Test 1 1. a) Define transition element. [2m] b) Explain why scandium and zinc are not considered as transition elements whereas copper is one. [2m] c) i. Write the electronic configuration of a chromium atom. [1m] Ii. explain why this configuration disobey the Aufbau rule. [2m] d) In acidic solution, the dichromate (VI) ion is a powerful oxidising agent. i. What is the colour of the dichromate (VI) ion? [1m] Ii.write an ion/electron equation to illustrate the oxidising property of the dichromate (VI) ion. [2m] 2. How does the electronic configuration of a transition metal differs from the elements in the main groups of the Periodic Table? You may use iron and calcium as examples. [5m] 3. Give four characteric properties of transition elements or their compounds. Illustrate your answer by reference to suitable examples. [8m]