构造原理（aufbau）有哪些例外？
What are the exceptions to the aufbau (building-up) principle?
半满或全满的 d 亚层更稳定，使 Cr、Cu 等原子把本该进入 4s 的电子转入 3d，导致 [Ar]3d⁵4s¹ 或 [Ar]3d¹⁰4s¹ 这样的排布。Miessler 与 Tarr 在《无机化学》中列出了这些偏离。
A half- or full-filled d subshell is more stable, so atoms like Cr and Cu shift an electron from 4s into 3d, giving [Ar]3d⁵4s¹ or [Ar]3d¹⁰4s¹. Miessler and Tarr list these deviations in 'Inorganic Chemistry'.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
Miessler 与 Tarr《无机化学》；Atkins《物理化学》
Miessler & Tarr, Inorganic Chemistry; Atkins, Physical Chemistry
独立核验依据 · Independent verification: 核验依据 1 ARCHIVE 标识 inorganicchemist00shri：Inorganic chemistry（扫描
#构造原理 #电子排布 #d亚层
什么是“镧系收缩”（lanthanide contraction）？它造成了哪些重要的元素性质异常？
What is the 'lanthanide contraction,' and what important anomalies in element properties does it cause?
镧系收缩指镧系元素（57–71号）从左到右原子半径和离子半径逐渐减小的现象，原因是4f电子屏蔽效应差，有效核电荷持续增大。它使得同族的镧系后元素（如锆与铪、铌与钽）半径异常接近、性质极相似而难以分离，并导致后续过渡金属原子半径偏小。
The lanthanide contraction is the steady decrease in atomic and ionic radii across the lanthanides (elements 57–71), caused by the poor shielding of 4f electrons, which raises the effective nuclear charge. It makes post-lanthanide same-group pairs such as zirconium-hafnium and niobium-tantalum almost identical in size and very hard to separate, and leaves later transition metals with smaller-than-expected radii.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录含书名，但缺版次 / 出版社 / 年份中的一部分，需编辑补全后才能做独立比对。
武汉大学《无机化学》（第三版），高等教育出版社
Wuhan University, 'Inorganic Chemistry' (3rd ed.), Higher Education Press
#镧系收缩 #4f电子 #屏蔽效应 #有效核电荷 #锆铪
什么是电负性，它在周期表上如何变化？
What is electronegativity and how does it vary on the periodic table?
电负性是原子在分子中吸引电子的能力，常用鲍林标度表示。它在周期表中从左到右增大、从下到上增大，氟是电负性最强的元素。
Electronegativity is an atom's ability to attract electrons in a molecule, commonly measured on the Pauling scale. It increases from left to right and from bottom to top across the periodic table, with fluorine being the most electronegative element.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Sam Kean,《The Disappearing Spoon》Little, Brown,2010;中译《元素的盛宴》接力出版社
S. Kean, The Disappearing Spoon, Little Brown, 2010; Chinese ed. Jielie Publishing House
#电负性 #鲍林 #氟
什么是原子半径的变化规律？
What is the trend of atomic radius?
原子半径在同一周期从左到右减小，因为核电荷增多把电子拉得更紧。在同一族从上到下增大，因为电子层数增加。
Atomic radius decreases from left to right across a period because greater nuclear charge pulls electrons closer. It increases down a group because more electron shells are added.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Sam Kean,《The Disappearing Spoon》Little, Brown,2010;中译《元素的盛宴》接力出版社
S. Kean, The Disappearing Spoon, Little Brown, 2010; Chinese ed. Jielie Publishing House
#原子半径 #周期 #族
什么是惰性气体（稀有气体）？
What are the noble gases?
稀有气体位于周期表最右侧，包括氦、氖、氩等，它们最外层电子已满，化学性质极其稳定、很难参与反应。因此常被用作保护气。
Noble gases sit at the far right of the periodic table, including helium, neon, and argon. Their outermost electron shells are full, making them extremely stable and unreactive, so they are often used as protective gases.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Sam Kean,《The Disappearing Spoon》Little, Brown,2010;中译《元素的盛宴》接力出版社
S. Kean, The Disappearing Spoon, Little Brown, 2010; Chinese ed. Jielie Publishing House
#稀有气体 #稳定性 #氦
过渡金属为什么常呈现多种颜色和可变化合价？
Why do transition metals often show colors and variable oxidation states?
过渡金属有未充满的 d 轨道，电子可在不同 d 能级间跃迁（d–d 跃迁）吸收可见光，使化合物显色。多种氧化态则源于 (n-1)d 与 ns 电子能量接近，可不同程度失去。这带来丰富的催化与配位化学。
Transition metals have partially filled d orbitals; electrons can jump between d levels (d–d transitions) absorbing visible light, coloring their compounds. Multiple oxidation states arise because (n-1)d and ns electrons have similar energies and can be lost to varying degrees. This yields rich catalysis and coordination chemistry.
难度 进阶 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-10-03
来源 · Source
《无机化学》（武汉大学等编）
Inorganic Chemistry (Wuhan Univ.)
#过渡金属 #d轨道 #可变价
什么是碱金属？
What are the alkali metals?
碱金属是周期表第一族（除氢外）的元素，如锂、钠、钾，它们最外层只有一个电子，极易失去而表现强活泼性。它们遇水会剧烈反应放出氢气。
The alkali metals are the elements of group 1 (except hydrogen), such as lithium, sodium, and potassium. They have only one outer electron and readily lose it, making them highly reactive. They react violently with water to release hydrogen.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Sam Kean,《The Disappearing Spoon》Little, Brown,2010;中译《元素的盛宴》接力出版社
S. Kean, The Disappearing Spoon, Little Brown, 2010; Chinese ed. Jielie Publishing House
#碱金属 #钠 #活泼
原子半径在周期表上如何变化？
How does atomic radius vary across the periodic table?
同一周期从左到右，有效核电荷增大，原子半径逐渐减小；同一族从上到下，电子层数增加，半径增大。过渡金属区变化较缓。原子半径直接影响键长、硬度和反应活性。
Across a period left to right, rising effective nuclear charge shrinks atomic radius; down a group, added electron shells enlarge it. The transition block changes more slowly. Atomic radius directly affects bond length, hardness, and reactivity.
难度 进阶 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
大连理工大学无机化学教研室 编,《无机化学》第6版,高等教育出版社
Dalian University of Technology Inorganic Chemistry Group, Inorganic Chemistry, 6th ed., Higher Education Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787040492750（豆瓣书目条目: 无机化学）
#原子半径 #有效核电荷 #周期趋势
鲍林电负性标度是如何比较原子吸引电子能力的？整个周期表中电负性最大的元素是哪个？
How does the Pauling electronegativity scale compare atoms' ability to attract electrons, and which element is the most electronegative in the periodic table?
鲍林电负性是基于键能经验数据定义的相对标度，数值越大表示原子在共价键中吸引共用电子对的能力越强。氟的电负性最高（约3.98），是周期表中吸引电子能力最强的元素，因而几乎总是共价化合物中带部分负电的一方。
The Pauling electronegativity scale is a relative scale derived from empirical bond-energy data; the larger the value, the stronger an atom's ability to attract shared electron pairs in a covalent bond. Fluorine has the highest electronegativity (about 3.98) and is the strongest electron-attracting element in the periodic table, so it is almost always the partially negative end of covalent compounds.
难度 进阶 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
L. 鲍林《化学键的本质》（The Nature of the Chemical Bond）；IUPAC
L. Pauling, 'The Nature of the Chemical Bond'; IUPAC
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL63205W：Nature of the chemical bo
#电负性 #鲍林 #氟 #键能 #共价键
同一周期从左到右原子半径为什么变小？
Why does atomic radius shrink across a period left to right?
沿周期增加核电荷而新增电子进入同层，有效核电荷增大，把电子云拉得更紧，故半径递减。这一趋势在 Atkins 与 Housecroft 的教材中由屏蔽与有效核电荷解释。
Across a period the nuclear charge rises while added electrons enter the same shell, so the effective nuclear charge grows and pulls the cloud tighter, shrinking the radius. Atkins and Housecroft explain it via shielding and effective nuclear charge.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
Atkins《物理化学》；Housecroft 与 Sharpe《无机化学》
Atkins, Physical Chemistry; Housecroft & Sharpe, Inorganic Chemistry
独立核验依据 · Independent verification: 核验依据 1 ARCHIVE 标识 inorganicchemist00shri：Inorganic chemistry（扫描
#原子半径 #有效核电荷 #周期趋势
周期表上电负性如何变化？
How does electronegativity vary across the periodic table?
同一周期从左到右电负性总体增大，因为核电荷增加、原子半径减小、对电子吸引力增强。同一族从上到下电负性减小。氟是电负性最大的元素，铯和钫最小。这一趋势帮助预测键型和反应性。
Across a period from left to right, electronegativity generally increases as nuclear charge grows and radius shrinks, strengthening electron attraction. Down a group it decreases. Fluorine is the most electronegative element; cesium and francium the least. This trend predicts bond type and reactivity.
难度 进阶 · 适合 小学低段(6-8)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
大连理工大学无机化学教研室 编,《无机化学》第6版,高等教育出版社
Dalian University of Technology Inorganic Chemistry Group, Inorganic Chemistry, 6th ed., Higher Education Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787040492750（豆瓣书目条目: 无机化学）
#电负性 #周期趋势 #氟
什么是金属元素和非金属元素？
What are metals and nonmetals?
金属元素通常能导电导热、有金属光泽且易失去电子，多位于周期表左侧。非金属元素多在右侧，常得到或共用电子，许多在常温下是气体。
Metal elements usually conduct electricity and heat, have a metallic luster, and tend to lose electrons, and they sit mostly on the left of the periodic table. Nonmetals are mostly on the right, tend to gain or share electrons, and many are gases at room temperature.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Sam Kean,《The Disappearing Spoon》Little, Brown,2010;中译《元素的盛宴》接力出版社
S. Kean, The Disappearing Spoon, Little Brown, 2010; Chinese ed. Jielie Publishing House
#金属 #非金属 #导电
稀有气体为什么几乎不反应？
Why are the noble gases almost unreactive?
稀有气体的最外层电子恰好填满，形成特别稳定的闭壳层结构，既不易失去也不易得到电子。直到 1962 年 Bartlett 才合成出首个稀有气体化合物 XePtF₆，打破其“绝对惰性”的旧观念。
Noble gases have filled outer shells—a especially stable closed configuration—so they neither easily lose nor gain electrons. Only in 1962 did Bartlett make the first noble-gas compound, XePtF₆, overturning their supposed absolute inertness.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
Atkins《物理化学》；Housecroft 与 Sharpe《无机化学》；Bartlett 1962
Atkins, Physical Chemistry; Housecroft & Sharpe, Inorganic Chemistry; Bartlett (1962)
独立核验依据 · Independent verification: 核验依据 1 ARCHIVE 标识 inorganicchemist00shri：Inorganic chemistry（扫描
#稀有气体 #闭壳层 #惰性
元素周期表里的行和列叫什么？
What are the rows and columns of the periodic table called?
周期表里的横行叫周期，同一周期的元素电子层数相同。竖列叫族，同一族的元素最外层电子数相近，化学性质相似。
The horizontal rows of the periodic table are called periods, and elements in one period have the same number of electron shells. The vertical columns are called groups, and elements in a group have similar outer-electron counts and chemical properties.
难度 入门 · 适合 小学高段(9-12)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Sam Kean,《The Disappearing Spoon》Little, Brown,2010;中译《元素的盛宴》接力出版社
S. Kean, The Disappearing Spoon, Little Brown, 2010; Chinese ed. Jielie Publishing House
#周期 #族 #电子层
碱金属和卤素各有什么典型性质？
What are the typical properties of alkali metals and halogens?
碱金属（第 1 族）最外层只有一个电子，极易失去，性质极活泼、密度小、熔点低。卤素（第 17 族）最外层缺一个电子，易得电子，单质多为有色挥发物且氧化性强。两者相遇易生成典型离子化合物（如食盐）。
Alkali metals (group 1) have one valence electron, lose it readily, and are very reactive, low-density, and low-melting. Halogens (group 17) need one electron, gain it readily, and form colored, often volatile, strongly oxidizing substances. Together they readily form classic ionic compounds like table salt.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-10-03
来源 · Source
《无机化学》（北京师范大学等编）
Inorganic Chemistry (Beijing Normal Univ.)
#碱金属 #卤素 #族性
门捷列夫周期表最重要的预言性贡献是什么？元素周期律的核心思想是什么？
What was the most prophetic contribution of Mendeleev's periodic table, and what is the core idea of the periodic law?
1869年门捷列夫按原子量排列元素时，特意留出空白格并预言了若干尚未发现元素（如“类铝”镓、“类硅”锗）的性质，后来都被证实。周期律的核心思想是：元素的性质随原子量的递增呈周期性变化——后来修正为随原子序数（核电荷）周期性变化。
In 1869 Mendeleev arranged elements by atomic weight but left deliberate gaps and predicted the properties of undiscovered elements (e.g., 'eka-aluminum' = gallium, 'eka-silicon' = germanium), later confirmed. The core of the periodic law is that element properties vary periodically with increasing atomic weight—later refined to variation with increasing atomic number (nuclear charge).
难度 入门 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据结论有争议 · Contested
来源 · Source
大连理工大学无机化学教研室 编,《无机化学》第6版,高等教育出版社
Dalian University of Technology Inorganic Chemistry Group, Inorganic Chemistry, 6th ed., Higher Education Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787040492750（豆瓣书目条目: 无机化学）
#门捷列夫 #周期律 #元素周期表 #预言 #原子量
金和银为什么不容易生锈？
Why do gold and silver resist rusting?
金的化学性质非常稳定，几乎不与空气中的物质反应，所以永远闪亮。银虽较稳定，但会与硫化物反应生成黑色的硫化银。
Gold is so chemically stable that it almost never reacts with substances in air, so it stays shiny forever. Silver is fairly stable but reacts with sulfides to form black silver sulfide.
难度 入门 · 适合 小学低段(6-8)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Sam Kean,《The Disappearing Spoon》Little, Brown,2010;中译《元素的盛宴》接力出版社
S. Kean, The Disappearing Spoon, Little Brown, 2010; Chinese ed. Jielie Publishing House
#金 #银 #稳定性
稀有气体在周期表的哪一族？为什么叫惰性？
Which group are noble gases in and why are they called inert?
稀有气体位于第 18 族（0 族），最外层电子层全充满（除氦为 2 电子），达到稳定结构。它们过去被认为几乎不与其他元素反应，故又称惰性气体。1962 年后才发现少数化合物，改称稀有气体更准确。
Noble gases sit in group 18 with completely filled outer shells (helium has two), a stable configuration. They were long thought to react with almost nothing, hence inert gases. After 1962 compounds were found, so noble gas is the more accurate name.
难度 入门 · 适合 幼儿(3-6)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
大连理工大学无机化学教研室 编,《无机化学》第6版,高等教育出版社
Dalian University of Technology Inorganic Chemistry Group, Inorganic Chemistry, 6th ed., Higher Education Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787040492750（豆瓣书目条目: 无机化学）
#稀有气体 #第18族 #稳定结构
元素周期表是按什么规律排列的？
What rule is used to arrange the periodic table?
元素周期表按原子序数从小到大排列，并把化学性质相似的元素放在同一列。这样排布能清楚展示元素性质的周期性变化。
The periodic table is arranged by increasing atomic number, placing elements with similar chemical properties in the same column. This layout clearly shows the periodic changes in element properties.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Sam Kean,《The Disappearing Spoon》Little, Brown,2010;中译《元素的盛宴》接力出版社
S. Kean, The Disappearing Spoon, Little Brown, 2010; Chinese ed. Jielie Publishing House
#周期表 #原子序数 #周期性
元素周期律的核心是什么？
What is the core of the periodic law?
元素周期律指元素的性质随原子序数（核电荷数）的递增呈周期性变化。门捷列夫最早按相对原子质量排布并预言未知元素，后来揭示真正周期为原子序数。同族元素因价电子构型相似而性质相近。
The periodic law states that element properties vary periodically with increasing atomic number (nuclear charge). Mendeleev first arranged them by atomic mass and predicted unknown elements; the true period was later shown to be atomic number. Elements in a group share similar valence configurations and properties.
难度 入门 · 适合 幼儿(3-6)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
大连理工大学无机化学教研室 编,《无机化学》第6版,高等教育出版社
Dalian University of Technology Inorganic Chemistry Group, Inorganic Chemistry, 6th ed., Higher Education Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787040492750（豆瓣书目条目: 无机化学）
#元素周期律 #原子序数 #门捷列夫