1 Which statement about the periodic table is not correct?
A Elements in the same group have similar chemical properties.
B The elements are ordered by increasing atomic mass.
C The elements are ordered by increasing atomic number.
D There is a repeating trend of physical and chemical properties across the periods.
Your answer [1]
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, 2 The table shows the melting points of some of the elements in Period 3 of the periodic table.
Element Al Si P4 S8
Melting point / °C 660 1410 44 119
Explain the melting points in terms of bonding and structure.
[6]
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, 3 Chlorine has the electron configuration [Ne]3s23p5.
Which statement(s) about chlorine is/are correct when it reacts in redox reactions?
1 It can gain one electron to form 1– ions.
2 It can lose its 3s2 electrons to form 2+ ions.
3 It can lose its 3p5 electrons to form 5+ ions.
A 1, 2 and 3
B Only 1 and 2
C Only 2 and 3
D Only 1
Your answer [1]
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, 4(a) This question is about periodicity and the reaction of some Group 2 metals.
Periodicity is the repeating trend in properties of elements across different periods in the periodic table.
i. Complete the table below with the electron configurations and blocks.
Group 2 Group 17 (7)
Period 2 Be F
1s2 ........................................................ 1s2 ........................................................
Period 3 Mg Cl
1s2 ........................................................ 1s2 ........................................................
Block ............................. .............................
[3]
ii. Use your answers to (i) to explain why electron configuration is an example of a periodic trend.
[2]
iii. Mg forms 2+ ions but Cl usually forms 1– ions in their reactions. Explain why.
[2]
iv. Magnesium reacts with oxygen in the air.
Write the equation for this reaction.
[1]
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A Elements in the same group have similar chemical properties.
B The elements are ordered by increasing atomic mass.
C The elements are ordered by increasing atomic number.
D There is a repeating trend of physical and chemical properties across the periods.
Your answer [1]
© OCR 2025. You may photocopy this page. 1 of 46 Created in ExamBuilder
, 2 The table shows the melting points of some of the elements in Period 3 of the periodic table.
Element Al Si P4 S8
Melting point / °C 660 1410 44 119
Explain the melting points in terms of bonding and structure.
[6]
© OCR 2025. You may photocopy this page. 2 of 46 Created in ExamBuilder
, 3 Chlorine has the electron configuration [Ne]3s23p5.
Which statement(s) about chlorine is/are correct when it reacts in redox reactions?
1 It can gain one electron to form 1– ions.
2 It can lose its 3s2 electrons to form 2+ ions.
3 It can lose its 3p5 electrons to form 5+ ions.
A 1, 2 and 3
B Only 1 and 2
C Only 2 and 3
D Only 1
Your answer [1]
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, 4(a) This question is about periodicity and the reaction of some Group 2 metals.
Periodicity is the repeating trend in properties of elements across different periods in the periodic table.
i. Complete the table below with the electron configurations and blocks.
Group 2 Group 17 (7)
Period 2 Be F
1s2 ........................................................ 1s2 ........................................................
Period 3 Mg Cl
1s2 ........................................................ 1s2 ........................................................
Block ............................. .............................
[3]
ii. Use your answers to (i) to explain why electron configuration is an example of a periodic trend.
[2]
iii. Mg forms 2+ ions but Cl usually forms 1– ions in their reactions. Explain why.
[2]
iv. Magnesium reacts with oxygen in the air.
Write the equation for this reaction.
[1]
© OCR 2025. You may photocopy this page. 4 of 46 Created in ExamBuilder
