同种元素化合价越低半径越大吗（核言碎语186）

同种元素化合价越低半径越大吗（核言碎语186）（待续）如果我们算上人造元素，目前密度最大的是钅黑。钅黑是一种化学元素，符号为Hs，原子序数为108。它是一种合成元素（首先在德国的哈斯合成），具有放射性。已知最稳定的同位素是269Hs，其半衰期约为9.7秒。它的估计密度为40.7 x 10^3 kg/m^3。钅黑的密度源于其高原子重量和镧系元素离子半径的显著减小，即镧系收缩和锕系收缩。Since nucleons (protons and neutrons) make up most of the mass of ordinary atoms the density of normal matter tends to be limited by how closely we can pack these nucleons and depends on the internal atomic structure of a substan

137 化学元素的密度

Density of Chemical Elements

（https://www.nuclear-power.com/）

化学元素的密度

• Atomic Number Density. The atomic number density (N; atoms/cm3) which is associated with atomic radii is the number of atoms of a given type per unit volume (V; cm3) of the material. The atomic number density (N; atoms/cm3) of a pure material having atomic or molecular weight (M; grams/mol) and the material density (⍴; gram/cm3) is easily computed from the following equation using Avogadro’s number (NA = 6.022×1023 atoms or molecules per mole):
• 原子序数密度。原子序数密度（N；原子/cm^3），与原子半径有关，是材料在单位体积（V；cm^3）中给定类型的原子数量。纯物质的原子序数密度（N；原子/cm^3），已知原子量或分子量（M；克/摩尔）和物料密度（⍴；克/cm^3），是很容易用阿伏伽德罗常数（NA = 6.022×10^23每摩尔原子或分子）从下面的公式计算出来:

Since nucleons (protons and neutrons) make up most of the mass of ordinary atoms the density of normal matter tends to be limited by how closely we can pack these nucleons and depends on the internal atomic structure of a substance. The densest material found on earth is the metal osmium but its density pales by comparison to the densities of exotic astronomical objects such as white dwarf stars and neutron stars.

由于核子（质子和中子）构成了普通原子的大部分质量，正常物质的密度往往受到我们能将这些核子包裹得多紧密而有所限制，并取决于物质的内部原子结构。地球上密度最大的物质是金属锇，但与白矮星和中子星等奇异天体的密度相比，它的密度就相形见绌了。

If we include man made elements the densest so far is Hassium. Hassium is a chemical element with symbol Hs and atomic number 108. It is a synthetic element (first synthesised at Hasse in Germany) and radioactive. The most stable known isotope 269Hs has a half-life of approximately 9.7 seconds. It has an estimated density of 40.7 x 103 kg/m3. The density of Hassium results from its high atomic weight and from the significant decrease in ionic radii of the elements in the lanthanide series known as lanthanide and actinide contraction.

如果我们算上人造元素，目前密度最大的是钅黑。钅黑是一种化学元素，符号为Hs，原子序数为108。它是一种合成元素（首先在德国的哈斯合成），具有放射性。已知最稳定的同位素是269Hs，其半衰期约为9.7秒。它的估计密度为40.7 x 10^3 kg/m^3。钅黑的密度源于其高原子重量和镧系元素离子半径的显著减小，即镧系收缩和锕系收缩。

（待续）