(a) Using the periodic table provided, write down the shorthand electron notation for the following three elements and indicate whether they are active, inactive or intermediate: Scandium (Sc): Argon (Ar); Aluminium (Al) (b) Metals are conductors of electricity whereas insulators such as ceramic materials are not. Using the honding theory, show and explain why metals are conductors and ceramics are insulators. (c) Aluminium is a good conductor of electricity. A 100 m aluminium wire of điameter 2.25 mm is to be used in domestic electrical wiring. If a voltage of 250V and a current of 13 amps are needed, answer the following i. What is the conductivity of the aluminium wire? Give two reasons why aluminium wire is not used in domestic wiring in Zambia?
(a) Using the periodic table provided, write down the shorthand electron notation for the following three elements and indicate whether they are active, inactive or intermediate: Scandium (Sc): Argon (Ar); Aluminium (Al) (b) Metals are conductors of electricity whereas insulators such as ceramic materials are not. Using the honding theory, show and explain why metals are conductors and ceramics are insulators. (c) Aluminium is a good conductor of electricity. A 100 m aluminium wire of điameter 2.25 mm is to be used in domestic electrical wiring. If a voltage of 250V and a current of 13 amps are needed, answer the following i. What is the conductivity of the aluminium wire? Give two reasons why aluminium wire is not used in domestic wiring in Zambia?
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Transcribed Image Text:(a) Using the periodic table provided, write down the shorthand electron notation for the following three
elements and indicate whether they are active, inactive or intermediate:
Scandium (Sc):
Argon (Ar); Aluminium (Al)
(b) Metals are conductors of electricity whereas insulators such as ceramic materials are not. Using the
honding theory, show and explain why metals are conductors and ceramics are insulators.
(c) Aluminium is a good conductor of electricity. A 100 m aluminium wire of diameter 2.25 mm is to be
used in domestic electrical wiring. If a voltage of 250V and a current of 13 amps are needed,
answer the following
i.
What is the conductivity of the aluminium wire?
ii.
Give two reasons why aluminium wire is not used in domestic wiring in Zambia?
ii.
Give three applications of pure aluminium.
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