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Lesson Worksheet: Ionization Energy Chemistry

In this worksheet, we will practice describing and explaining the ionization energy of elements and ions.

Q1:

Given the data of successive ionization energies (in kJ/mol) in the table shown, which of the following elements is most likely to be in group III of the periodic table?

Element1st2nd3rd4th5th6th
17901,6003,2004,40016,10019,800
25004,6006,9009,50013,40016,600
35901,1004,9006,5008,10010,500
45801,8002,70011,60014,80018,400
58701,8002,7003,6005,7006,700
  • AElement 4
  • BElement 2
  • CElement 5
  • DElement 1
  • EElement 3

Q2:

Which of the following equations represents the first ionization energy of an element X?

  • AX()+eX()gg+
  • BX()+eX()+gg
  • CX()X()+egg+

Q3:

Which element in the pair of adjacent elements, Mg and Na, has a higher first ionization energy?

  • ANa
  • BMg

Q4:

An element, X, from the 3rd period of the periodic table has a second ionization energy that is higher than that of the neighboring two elements.

What is the electronic configuration of element X?

  • A12233sspsp
  • B12233sspsp
  • C1223ssps
  • D12233sspsp
  • E12233sspsp

Q5:

The following table shows the data of successive ionization energies of a metal, M. What is the likely formula of the sulfide compound formed in the reaction between sulfur and metal M?

Successive Ionization Energies of Element M (kJ/mol)
5901,1004,9006,5008,10010,50012,30014,200
  • AMS23
  • BMS
  • CMS2
  • DMS2

Q6:

The following table shows rounded successive ionization energies of element X. What is the correct identity of X?

Successive Ionization Energies of Element X (kJ/mol)
8701,8002,7003,6005,7006,70012,00014,000
  • AGermanium
  • BTellurium
  • CKrypton
  • DStrontium
  • EBromine

Q7:

The following sketch graph shows a section of a graph with 1st ionization energies on the 𝑦-axis plotted against the atomic number on the 𝑥-axis.

Which number from the graph could represent the element Al?

Which number could represent the element He?

Q8:

Which of the following elements has the lowest value of the first ionisation potential?

  • APotassium (K)19
  • BNeon (Ne)10
  • CIron (Fe)26
  • DCalcium (Ca)20

Q9:

Which of the following equations is correct?

  • ANa()+eNa()+energy=kJmolgg+Δ𝐻496/
  • BNa()+energyNa()+e=kJmolgg+Δ𝐻496/
  • CNa()+energyNa()+e=kJmolgg+Δ𝐻+496/
  • DNa()+eNa()+energy=kJmolgg+Δ𝐻+496/

Q10:

Which of the following is the correct descending order for ionisation energy?

  • A7N, 8O, 16S, 15P
  • B8O, 7N, 16S, 15P
  • C8O, 7N, 15P, 16S
  • D15P, 16S, 7N, 8O

This lesson includes 17 additional questions and 6 additional question variations for subscribers.

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