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Mill Hill High SchoolPAGE 1
...)()()()()()“Period Pains”
Y12 Unit 1 Test 4
1.4 PERIODICITY
Boa sorte!
Answer all questions
Total 25 marks
Name:………………………………………….
SECTION A TOTAL …………../18
SECTION B TOTAL …………/7
TOTAL ………………./25
= …………………..%
Grade __________
SECTION A
1.(a)Explain why certain elements in the Periodic Table are classified as p-block elements.
Illustrate your answer with an example of a p-block element and give its electronic configuration.
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(3)
(Total 3 marks)
2.(a)Explain why electrical conductivity decreases across Period 3 from sodium to phosphorus.
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(3)
(b)The table below shows the melting temperatures, Tm, of the Period 3 elements.
ElementNaMgAlSiPSClArTm/K371923933168031739217284Explain the following in terms of
structure and bonding.
(i)Magnesium has a higher melting temperature than sodium.
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(2)
(ii)Silicon has a very high melting temperature.
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(2)
(iii)Sulphur has a lower melting temperature than magnesium.
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(2)
(iv)Argon has a lower melting temperature than chlorine.
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(3)
(Total 12 marks)
3.(a)(i)Define the term electronegativity.
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(2)
(ii)State why argon has no electronegativity value.
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(1)
(Total 3 marks)
SECTION B
4.Why are the elements sodium to argon placed in Period 3 of the Periodic Table? Describe and
explain the trends in electronegativity and atomic radius across Period 3 from sodium to sulphur.
(7)
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