mass在这里应该是质量的意思，这句话的意思是说一个原子的所有质量几乎都在它的原子核上。the mass of an atom 指的是任意一个原子， a mass of 才表示大量其实看你怎么理解啦！an atom里自然有一个总量，那么the mass of就是它的大量了。换句话说，mass可以跟可数，也可以跟不可数，单数也有大量啊！很高兴为你解答！老师祝你学习进...
The Atom and Its Nucleus, Mass and EnergyS.E. HUNT Ph.D., F.Inst.P., F.I.Nuc.E.
The mass number of an atom is the total number of protons and neutrons contained within the nucleus of the atom. The number of protons determines the element and will always equal the atomic number of that element. The number of neutrons can change and will determine which isotope of that...
The mass of an atom in atomic mass units (called the atom's istopic mass) si numerically close to the atom's Aatomic number Bmass number Catomic weight DatomicitySubmit The mass of an atom of nitrogen is A146.023×1023g B286.023×1023g C16.023×1023g D14uSubmit The mass of an ato...
Mass of the Atom: Mass of the atom is the addition of the neutron and proton that are found inside the nucleus of the atom. The SI unit of the mass of the atoms is a kilogram, but it is usually represented in a.m.u(atomic mass unit). We can say the atomic mass is nothing but...
Nucleus:The nucleus of atoms was discovered by Ernest Rutherford in the early 1900s through his gold foil experiments. In the experiment, he found that positively charged particles were sometimes encountering a positively charged region of atoms and being deflected by it. This e...
The main nuclear reaction is the transformation of hydrogen into helium, where 0.7% of the mass is converted into radiation (according to Einstein's energy equivalence, E = mc2), the so-called p-p chain, which starts with the fusion of two protons into a nucleus of deuterium (2He), ...
原子atom adj. atomic 原子核 nucleus 质子proton 中子neutron 电子electron(abbr. e) 离子ion 阳离子 cation 阴离子 anion 分子molecular 单质element 化合物 compound 纯净物 pure substance/chemical substance 混合物 mixture 相对原子质量 relative atomic mass(abbr. Ar) ...
1/12 the mass of a neutral atom of 12C, equal to 931.5 MeV. Atomic number (Z) Integer equal to the number of protons in a nucleus; the order of an element in the periodic table. Atomic weight or nuclear mass number (A) An integer equal to the sum of the number of protons Z and...
The ammonia molecule consists of three hydrogen atoms and one nitrogen atom situated on the corners of a pyramid. When the hydrogen atoms are located at x = +0.814 × 10−10 m, y = 0, z = 0; x = −0.814 × 10−10 m, y = 0; z = 0, and x = 0, y = + 1.41 × 10...