“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.
Element	Na	Mg	Al	Si	P	S	Cl	Ar	
Tm/K	371	923	933	1680	317	392	172	84	
Explain 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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