Describe how to find the mass of an atom. What is the difference between atomic number and mass number of an atom? What is the crystal structure of graphene? What atomic particle in an atom is the same for each element? Which particle of an atom has the least mass?
The atomic weight of an atom, or the molecular weight of a molecule, is its mass relative to that ofa___ atom. This is essentially equal to the number of protons plus neutrons that the atom or molecule contains. A oxygen B hydrogen C helium D carbon 相关知识点: 试题来源: 解析 B ...
An atom has a mass number of 24 and 13 neutrons. what is the atomic number of this atom? An atom has a mass number of 25 and 13 neutrons. what is the atomic number of this atom? An atom has an atomic number of 12 and a mass number of 25. how many neutrons doe...
hydrogen atom(s) equal to 1.01 amu?The sample of hydrogen has a mass of 1.01g,how many hydrogenatoms make up 1.01g? 相关知识点: 试题来源: 解析 1个碳原子的质量用原子质量单位(amu)表示是多少? (注:原子质量单位amu就是道尔顿Da)1个碳原子的质量用克表示是多少?1个氧原子的质量用原子质量单位...
Answer: That most of the mass of the atom was concentrated in a very small, positively charged nucleus at the center of the atom, while the electrons orbited around it. II. Main Idea 1. What is the main idea of this passage? Answer: The passage's main idea is to describe how the ...
The atomic number of a chemical element is the number of protons found in the nucleus of every atom of that element. The atomic number uniquely identifies a chemical element. It is identical to the charge number of the nucleus. In an uncharged atom, the ...
the mass of a hydrogen atom 1/1H is equal to 1/12 of the mass of a carbon-12 atomso 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...
1 The relative atomic mass of an element is always D A the mass of an atom of the element relative to z the mass of a carbon-12 atom. B the mass of an atom of the element relative to the mass of a hydrogen atom.□ C the weighted mean mass of an atom of the element relative...
An atom is the smallest unchangeable component of a chemical element. Unchangeable means in this case by chemical means; i.e., by reactions with acids or bases or the effect of moderate temperatures, atoms may only be slightly changed, namely, in their degree of ionisation. Moderate ...
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...