International ASChemistryEdexcelExam Questions1. Structure, Bonding & Introduction to Organic ChemistryThe Periodic Table

The Periodic Table (Edexcel International AS Chemistry): Exam Questions

Exam code: XCH11

39 mins6 questions

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The Periodic Table

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1
1 mark

The Period 2 element with the highest melting temperature is

  • aluminium

  • boron

  • carbon

  • silicon

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1
1 mark

In which series are the elements in order of increasing melting temperature?

  • I2  <  Br2  <  Cl2  <  F2

  • Li  <  Be  <  B  <  C

  • Li  <  Na  <  K  <  Rb

  • Si  <  P  <  S  <  Cl

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2a
1 mark

The graph shows the first ionisation energies of the elements in Period 3, labelled A to H in order of increasing atomic number.

Bar chart showing first ionisation energies of Period 3 elements. Energy increases from A (Na) to H (Ar), peaking at H (Ar) with 1,500 kJ/mol.

Element X has the electronic configuration [Ne] 3s2 3p2.

Which letter on the graph labels element X?

  • C

  • D

  • E

  • F

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2b
1 mark

The first ionisation energy of element C is lower than that of element B. What is the reason for this?

  • Element C's outermost electron is paired

  • Element C has fewer protons than element B

  • Element C has more outer-shell electrons than element B, increasing electron–electron repulsion

  • Element C's outermost electron occupies a 3p sub-shell, which is at a higher energy and more shielded than the 3s sub-shell holding element B's outermost electron

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2c
1 mark

The first ionisation energy of element F is lower than that of element E. What is the reason for this?

  • Element F has more shielding than element E

  • Element F has a larger atomic radius than element E

  • Element F's outermost electron is in a higher-energy sub-shell than element E's

  • Element F has 3p4 with one paired orbital — the spin-pair repulsion makes one of the paired electrons easier to remove than an electron from element E's 3p3

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