Identify the figure showing the successive ionization energies of Mg.

Question

BlackTom AI · Accepted Answer

To identify the figure showing Mg’s successive ionization energies, I will compare the general pattern of ionization energies for a metal with a noble-gas core like magnesium.

- Concept to apply: Magnesium has the electron configuration [Ne] 3s^2. The first two ionizations remove the two 3s electrons, which require relatively small amounts of energy. Once those two valence electrons are removed, the next electron is taken from a closed-shell (Ne) core, which requires a substantially larger amount of energy. Consequently, there is a dramatic jump in ionization energy after the second ionization, followed by relatively high but more uniform values for subsequent ionizations as electrons are removed from an increasingly positively charged, nearly noble-gas core.

- Option A (Figure I): If this figure showed only modest increases for the first few ionizations and then an abrupt enormous jump at an earlier ionization step (e.g., after the first or second), that would be inconsistent with Mg’s need to remove two valence electrons before hitting the core. This pattern would be more characteristic of a species with a different valence structure or a misrepresented trend.

- Option B (Figure II): This figure is expected to display small first and second ionization energies, followed by a large jump at the third ionization energy, with subsequent steps staying relatively high. This aligns with Mg’s [Ne] core and two valence electrons scenario, where the third ionization targets a core electron and requires much more energy. Therefore the profile matches the known trend for Mg.

- Option C (Figure III): If this graph showed a gradual, uniform increase across all successive ionizations without a notable jump after the second, it would contradict Mg’s core-electron structure. A lack of a pronounced jump fails to reflect the transition from valence to core electrons.

- Option D (Figure IV): If this figure had its large energy increments happening at different steps or displayed a pattern inconsistent with a noble-gas core after two valence electrons, it would not fit Mg’s expected ionization sequence. Magnesium’s characteristic large jump uniquely occurs when removing a core electron after two valence removals, not in a later or earlier unexpected step.

- Option E (I am unsure and need to study this concept to prepare for the exam): While acknowledging uncertainty is okay, this option does not engage with the reasoning about electron configurations and typical ionization-energy patterns necessary to identify the correct figure.

In summary, the correct interpretation relies on Mg having two valence electrons that are relatively easy to remove, followed by a substantial energy requirement for removing a core electron. The figure that exhibits a small first and second ionization energy with a pronounced jump at the third (and maintained high values thereafter) best matches Mg’s successive ionization-energy trend. This corresponds to Figure II.

CHEM 1210 AU2025 (15738) CHEM 1210 Practice Exam #4 v2 (Ch 7.1–7.4, 8, 9.1–9.6)- Requires Respondus LockDown Browser

Identify the figure showing the successive ionization energies of Mg.

查看解析

登录即可查看完整答案

类似问题

Given the following elements and three values of possible first ionization energies: Si, Na, Cl and 496, 1251, and 786 kJ·mol–1 Match the atoms with their ionization energies.

Nonmetals rarely lose electrons in chemical reactions because

For the elements Be, B, N and O, the order of increasing ionization energies are:

Which of the following equations represents the second ionization energy of calcium? 04A

Which of the following shows the correct relationship between the first ionization energies of the given elements?

For the elements Be, B, and N, the first ionization energy increases in the order:

Select the response which presents the three elements below in order of increasing first ionisation potential (IE1).

Select the response which presents the three elements below in order of increasing first ionisation potential (IE1).

更多留学生实用工具

考试浏览器助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单