Moreover, elements with heavier atomic mass were naturally more decoupled and unpredictable in space than those with lighter mass. Only the coupling of carbon, nitrogen and phosphorus, which are essential to life on Earth, deviated from this predictable pattern, suggesting that this anomaly may be...
Element Atomic # Atomic mass # of protons # of electrons # of neutrons Mg Rb Au Pb Explain how to draw the nucleus of an atom. Draw the nucleus of the following atoms: Phosphorus Neon Oxygen-12 Helium-5 Element Atomic # Atomic mass # of protons # of electrons...
试题来源: 解析 A 选项A中的质子和中子位于原子核内,构成了原子的主要质量,而电子的质量极小,可忽略不计。原子质量数即质子数与中子数之和。选项B和C错误地包含了电子,而选项D虽然所有粒子都包含,但电子贡献微乎其微,因此正确答案为A。反馈 收藏
Atomic mass number of an element is 232 and its atomic number is 90. The end product of this radiaoctive element is an isotope of lead (atomic mass 208 and at
Atomic Mass Online chemistry calculator which helps you to find the relative atomic weight (Amu) of a chemical element. Calculator of Atomic Mass (Amu) of an Element Number of Neutron: Atomic Mass:Amu Formula of Atomic Mass: A = Number of protons + Number of neutrons...
and its atomic number is 90 . The end product of this radiaoctive element is an isotope of lead (atomic mass 208 and atomic number 82 .) The number of α -and β -particles emitted are. A 6 , 3 B 6 , 4 C 5 , 5 D 4 , 6 Video SolutionStruggling...
1. The relative atomic mass of an element is always D I A the mass of an atom of the element relative to %2 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 ...
6 (a) An element X has an atomic number of 24 and a relative atomic mass of52.06. The natural element consists of four isotopes. The mass spectrum of the element X produced the following peaks of three of the isotopes on the chart recorder.Percentage83.804.302.4050 51 52 53 54 55 56 ...
The atomic mass of an atom is the total mass of the atom. Since the mass of protons and neutrons is almost 2000 times greater than that of electrons,...Become a member and unlock all Study Answers Start today. Try it now Create an account Ask a question Our experts can answer your...
, it is impossible to only have one isotope especially if the element has more than one naturally-occurring isotope. As such, it is important to always consider that all the naturally-occurring isotopes are considered because, naturally, they will have an effect ...