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单词 Group 2 elements
释义

Group 2 elements

原声例句
TED-Ed(视频版)

Neutrons have no repelling electric charge so they're easily captured by the iron group elements.

在核中形成中子中子不带电荷。

TED-Ed(视频版)

Axiom one: all group operations must be closed or restricted to only group elements.

公理一:所有群操作必须是封闭的或仅限于群元素。

TED-Ed(视频版)

Axiom four: every group element has an element called its inverse also in the group.

公理四:每个群元素在群中也有一个元素, 称为它的逆元素。

6 Minute English 六分钟英语

Even before World War Two, scientists had known about the potential energy inside uranium, the heaviest metal in the periodic table a diagram which groups the chemical elements into rows and columns according to their atomic number and symbol.

甚至在第二次世界大战之前,科学家们就已经知道铀内部的势能。铀是元素周期表中最重的金属,元素周期表是根据原子序数和原子符号将化学元素分成行和列的图表。

中文百科

碱土金属 Alkaline earth metal

(重定向自Group 2 elements)

碱土金属指的是元素周期表上第 2 族(ⅡA族)的八个金属元素,包括铍、镁、钙、锶、钡 和放射性元素镭、Ubn、Usn。

碱土金属都是银白色的,比较软的金属,密度比较小。碱土金属在化合物中是以+2的氧化态存在。碱土金属原子失去电子变为阳离子时,最外层一般是8个电子,但铍离子最外层只有2个电子。

碱土金属具有很好的延展性、可以制成许多合金、如镁铝合金。

碱土金属都是活泼金属。

英语百科

Alkaline earth metal 碱土金属

(重定向自Group 2 elements)
Image: Lump of beryllium
Image: Magnesium crystals
Image: Calcium stored under argon atmosphere
Image: Strontium floating in paraffin oil

The alkaline earth metals are six chemical elements in column (group) 2 of the Periodic table. They are beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra). They have very similar properties: they are all shiny, silvery-white, somewhat reactive metals at standard temperature and pressure.

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更新时间:2025/6/22 21:19:46