Name ________________
First Ionization Energy
Date:_________________
1. The amount of energy required to remove the outermost electron from a gaseous atom in the ground state is
known as
1) first ionization energy
2) activation energy
3) conductivity
4) electronegativity
2. Which of the following Group 2 elements has the lowest first ionization energy?
1) Be
2) Mg
3) Ca
4) Ba
3. Based on Reference Table S, which of the following atoms requires the least energy for the removal of the
most loosely bound electron?
1) Sn
2) Sr
3) Be
4) Br
4. How much energy is required to remove the most loosely bound electron from a neutral atom of carbon in
the gaseous phase?
1) 363 kJ
2) 441 kJ
3) 1086 kJ
4) 1242 kJ
5. Which sequence correctly places the elements in order of increasing ionization energy?
1) H ® Li ® Na ® K
2) I ® Br ® Cl ® F
3) O ® S ® Se ® Te
4) H ® Be ® Al ® Ga
6. Which electron configuration represents an element with the highest first ionization energy?
1) 2-1
2) 2-2
3) 2-8-1
4) 2-8-2
7. As the elements in Group 1 of the Periodic Table are considered from top to bottom, each successive
element has a
1) smaller first ionization energy
2) larger first ionization energy
3) smaller number of protons
4) larger number of valence electrons
8. In which of the following elements is the least amount of energy required to remove the most loosely bound
electron from an atom in the gaseous state?
1) Sr
2) Ar
3) Al
4) Cl
9. As the elements of Group 1 are considered in order from top to bottom, the first ionization energy of each
successive element will
1) decrease
2) increase
3) remain the same
10. As the elements of Group 1 on the Periodic Table are considered in order of increasing atomic radius, the
ionization energy of each successive element generally
1) decreases
2) increases
3) remains the same
11. Which atom in the ground state requires the least amount of energy to remove its valence electron?
1) lithium atom
2) potassium atom 3) rubidium atom
4) sodium atom
12. The element in Period 3 that has the highest first ionization energy is found in Group
1) 1
2) 2
3) 17
4) 18
13. Which element has an atom in the ground state with the most loosely bound electron?
1) He
2) As
3) Xe
4) Cs
Chemistry!
First Ionization Energy
14. What is the first ionization energy of an element that has the electron configuration 2-8?
1) 2372 kJ
2) 2081 kJ
3) 1313 kJ
4) 10 kJ
15. Which element in Group 17 is least likely to lose an electron?
1) chlorine
2) iodine
3) bromine
4) fluorine
16. Samples of four Group 15 elements, antimony, arsenic, bismuth, and phosphorus, are in the gaseous phase.
An atom in the ground state of which element requires the least amount of energy to remove its most
loosely held electron?
1) As
2) Bi
3) P
4) Sb
17. Of the following groups, the element with the lowest ionization energy would be found in Group
1) 2
2) 18
3) 17
4) 14
18. In the ground state, an atom of which element in Period 3 has an electron that is loosely bound?
1) Si
2) Na
3) S
4) Ar
19. Which element in Group 1 has the greatest tendency to lose an electron?
1) cesium
2) potassium
3) rubidium
4) sodium
20. Which atom requires the least energy to form a positive ion?
1) Ge
2) Ca
3) Ga
4) K
Chemistry!