3 CHEMISTRY-RELATIVE ATOMIC MASS the mass of a hydrogen atom 1/1H is equal to 1/12 of the mass of a carbon-12 atom, so its relative isotopic mass is 1.A magnesium atom 24/12Mg is twice as heavy as a carbon-12 atom,so its relative isotopic mass is 24 再给另一个例子 不要用英文...
If the mass of a hydrogen atom is 1.67*10^-27kg and the mass of an electron is 9.1*10^-31kg,how many electrons would be required to have a mass equivalent to one hydrogen atom? 相关知识点: 试题来源: 解析 这道题的意思是一个氢原子的质量是1.67*10^-27kg ,一个电子的质量是 9.1*10^...
so they are assumed to have a negligible effect. Consequently, the nucleus accounts for almost the entire mass of the atom of any element, which means that a single proton or neutron has an approximate mass of 1 AMU.
The water molecule is___two hydrogen atoms and one oxygen atom.水分子由二个氢原子和一个氧原子构成。(p.19Chemical Structure第3-4行) ▲ make up of常用被动式,意为“由……所组成”。如:①The train was made up of 15 coaches.这列火车有15节车厢。②All living matter is made up of cells...
The hydrogen atom in an expanding universe. Class. Quantum Grav., 16:1313, 1999. MATH MathSciNet ADSWilliam B. Bonnor, "Size of a Hydrogen Atom in the Expanding Universe," Classical and Quantum Gravity 16 (1999): 1313.W. B. Bonnor (1999) Size of a hydrogen atom in the expanding ...
What is the mass of one carbon atom in grams(g)What is the mass of one oxygen atom in amu?What is the mass of one oxygen atom in gThe sample of hydrogen has a mass of 1.01 amu?How many hydrogen atom(s) equal to 1.01 amu?The sample of hydrogen has a mass of 1.01g,how many ...
选项A 选项B 选项C 选项D 比较两个句子语法结构语义,选出最佳答案: The nucleus of a hydrogen atom contains over 99.9% of the mass of the atom, but only occupies 1/10,000 of the atom's volume. The nucleus of a hydrogen atom contains over 99.9% of the mass of the atom, but ...
chemistry test1.For a hydrogen atom, calculate the wavelength of the line in the Lyman series that results from the transition n=4 to n=1. what is the region of the electromagnetic spectrum? 2. For a hydrogen atom, calculate the energy of a photon in a Balmer series that results from ...
I take a simple model of the hydrogen atom in a universe without spatial curvature. The Maxwell equations are formulated on the background cosmic spacetime. For a class of cosmic metrics, which includes the de Sitter universe, these equations admit solutions corresponding to an atom whose radius...
Single-atom catalysts represent a unique catalytic system with high atomic utilization and tunable reaction pathway. Despite current successes in their optimization and tailoring through structural and synthetic innovations, there is a lack of dynamic mo