Element Halogens Element Noble Gas He 13 5 IIIA 10.81 14 6 IVA 12.01 15 7 VA 14.01 16 8 VIA 16 17 9 VIIA 19 10 Helium 20.18 Standard State (25oC - 101 kPA) Ne = Gas Fe = Solid Ga = Liquid Tc = Synthetic B 13 Boron 26.98 14 C Carbon 28.09 N Nitrogen 15 30.97 O Oxygen ...
The atomic number of the element is shown above the symbol. The atomic mass and the name of the element are shown below the symbol. The color indicates the physical state of the element at 25℃. The periodic table contains a weal...
The number of protons in the nucleus is called the atomic number. The atomic number of each element is unique. The combined number of protons and neutrons in an atom is called the atomic mass number. While theatomic numberalways stays the same. Some elements have atoms with different atomic...
化学里的元素(element)基本可以分成 metal(金属) 与 nonmetal (非金属) 两类,金属元素又有一系列特别的 transition metals(过渡金属)。周期表上金属与非金属交界处又有着一系列具有特殊性质的元素,被称为 metalloid(准金属) 或 semimetal(半金属X。 以下是几种常见元素信息名称的中英对照: 原子序数 - Atomic Num...
Selectanelement (=Internetlink)Name:HydrogenSymbol:HAtomicNumber:1AtomicMass:1.00794amuMeltingPoint:-259.14°C(14.009985°K,-434.45203°F)BoilingPoint:-252.87°C(20.280005°K,-423.166°F)Name:HeliumSymbol:HeAtomicNumber:2AtomicMass:4.002602amuMeltingPoint:-272.0°C(1.15°K,-457.6°F)...
As a result, this chart actually displays the mass number of a specific isotope for each element. An element's complete, unrounded atomic 238 U 93 NEPTUNIUM PLUTONIUM AMERICIUM Np Pu Am Cm Bk 237 244 243 CURIUM 94 95 96 97 98 247 BERKELIUM CALIFORNIUM EINSTEINIUM 247 Cf 251 99 Es Fm...
PERIOD 1 IA 18 VIIIA 1 1.008 2 4 1 H Group IUPAC Group CAS Metal Semi Metal Non Metal He Alkaline Metal Chalcogens Element Hydrogen 2 IIA 1 IA Alkaline Earth Metal Halogens Element 13 IIIA 14 IVA 15 VA 16 VIA 17 VIIA Helium 3 6.94 4 9.01 Atomic Number 1 1.008 Atomic Mass Transiti...
Atomic mass:The standard atomic weight of an element is the average mass of the element written in atomic mass units (amu). Even though each atom has roughly a whole number of atomic mass units, you will notice that the atomic mass on the periodic table is a decimal; that's because the...
On December 1st 2011, the IUPAC announced theproposed names for elements 114 and 116. Element 114 would be named flerovium with the symbol Fl, while element 116 would be named livermorium with the symbol Lv. There will be a five month comment period for the new names. If all goes well ...
This page provides comprehensive nuclide information for the element element No - Nobelium including: nuclide decay modes, half-life, branch ratios, decay energy, etc.