Question 1

Which of the following elements has the smallest ionization energy?

$$	ext{A) P}$$
$$	ext{B) S}$$
$$	ext{C) Cl}$$
$$	ext{D) Br}$$

Accepted Answer

Br

Question 2

Ionization energy is defined as:

$$	ext{A) The energy required to add an electron to a gaseous atom}$$
$$	ext{B) The energy required to remove an electron from a gaseous atom}$$
$$	ext{C) The energy released when an atom forms a bond}$$
$$	ext{D) The energy required to break a chemical bond}$$

Accepted Answer

The energy required to remove an electron from a gaseous atom

Question 3

Which element from Group 7A has the lowest ionization energy?

$$	ext{A) I}$$
$$	ext{B) Cl}$$
$$	ext{C) F}$$
$$	ext{D) Na}$$

Accepted Answer

I

Question 4

Which of the following elements would lose an electron the easiest?

$$	ext{A) N}$$
$$	ext{B) Li}$$
$$	ext{C) Zn}$$
$$	ext{D) B}$$

Accepted Answer

Li

Question 5

Which of the following has the highest ionization energy?

$$	ext{A) K}$$
$$	ext{B) Na}$$
$$	ext{C) Mg}$$
$$	ext{D) Ne}$$

Accepted Answer

Ne

Question 6

Rank the following elements in order of increasing ionization energy: Br, F, Ca, K, Se.

$$	ext{A) K \u003c Ca \u003c Br \u003c Se \u003c F}$$
$$	ext{B) F \u003c Se \u003c Br \u003c Ca \u003c K}$$
$$	ext{C) Br \u003c Se \u003c F \u003c Ca \u003c K}$$
$$	ext{D) Ca \u003c K \u003c Br \u003c Se \u003c F}$$

Accepted Answer

K \u003c Ca \u003c Br \u003c Se \u003c F

Question 7

What is the general trend for ionization energy across a period in the periodic table?

$$	ext{A) It decreases}$$
$$	ext{B) It increases}$$
$$	ext{C) It remains constant}$$
$$	ext{D) It fluctuates randomly}$$

Accepted Answer

It increases

Question 8

Why do noble gases have very high ionization energies?

$$	ext{A) They have incomplete electron shells}$$
$$	ext{B) Their electrons are far from the nucleus}$$
$$	ext{C) They have stable electron configurations}$$
$$	ext{D) They have low atomic numbers}$$

Accepted Answer

They have stable electron configurations

Question 9

Which of the following best explains why ionization energy decreases down a group?

$$	ext{A) Increased nuclear charge}$$
$$	ext{B) Increased electron shielding}$$
$$	ext{C) Decreased atomic radius}$$
$$	ext{D) More protons in the nucleus}$$

Accepted Answer

Increased electron shielding

Question 10

A patient is found to have a deficiency in potassium (K). Based on ionization energy trends, which other element might be considered as a substitute in medical treatments, and why?

$$	ext{A) Na, because it is in the same group and has similar ionization energy}$$
$$	ext{B) Ca, because it is in the same period}$$
$$	ext{C) F, because it has a high ionization energy}$$
$$	ext{D) Br, because it is a halogen}$$

Accepted Answer

Na, because it is in the same group and has similar ionization energy

Question 11

If an element has a very low ionization energy, what does this suggest about its chemical reactivity?

$$	ext{A) It is likely to gain electrons easily}$$
$$	ext{B) It is likely to lose electrons easily}$$
$$	ext{C) It is chemically inert}$$
$$	ext{D) It forms covalent bonds easily}$$

Accepted Answer

It is likely to lose electrons easily

Question 12

Which of the following elements would require the most energy to remove its outermost electron?

$$	ext{A) Mg}$$
$$	ext{B) Ne}$$
$$	ext{C) K}$$
$$	ext{D) Na}$$

Accepted Answer

Ne

Question 13

Which of the following elements is most likely to form a cation in a chemical reaction?

$$	ext{A) F}$$
$$	ext{B) Na}$$
$$	ext{C) Cl}$$
$$	ext{D) O}$$

Accepted Answer

Na

Question 14

Which of the following elements has the greatest tendency to lose an electron?

$$	ext{A) K}$$
$$	ext{B) F}$$
$$	ext{C) Br}$$
$$	ext{D) Se}$$

Accepted Answer

K

Question 15

Which of the following statements about ionization energy is correct?

$$	ext{A) Ionization energy increases down a group}$$
$$	ext{B) Ionization energy decreases across a period}$$
$$	ext{C) Ionization energy increases across a period}$$
$$	ext{D) Ionization energy remains constant across a period}$$

Accepted Answer

Ionization energy increases across a period

Question 16

Which element would be expected to have the lowest ionization energy in the third period?

$$	ext{A) Na}$$
$$	ext{B) Mg}$$
$$	ext{C) Al}$$
$$	ext{D) Cl}$$

Accepted Answer

Na

Question 17

A scientist is studying the reactivity of halogens. Which halogen would require the least energy to remove an electron?

$$	ext{A) F}$$
$$	ext{B) Cl}$$
$$	ext{C) Br}$$
$$	ext{D) I}$$

Accepted Answer

I

Question 18

Which of the following best describes the relationship between atomic radius and ionization energy?

$$	ext{A) As atomic radius increases, ionization energy increases}$$
$$	ext{B) As atomic radius increases, ionization energy decreases}$$
$$	ext{C) There is no relationship}$$
$$	ext{D) Both increase together across a period}$$

Accepted Answer

As atomic radius increases, ionization energy decreases

Ionization Energy and Periodic Trends

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