B) Protons and electronsC) Electrons and neutronsD)Electrons, protons, and neutronsAnswer: A 相关知识点: 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,...
The term atomic number , conventionally denoted by the symbol Z , indicates number of protons present in the nucleus of an atom, which is also equal to the number of electrons in an uncharged atom. The number of neutrons is represented by the neutron number ( N ). Because the mass of ...
Atomic mass is equal to the sum of the individual particle masses of an atom. It is typically calculated by adding the number of protons and neutrons together, ignoring the electrons due to their small size. The standard unit for measuring atomic mass is Dalton. Atomic mass units (amu) are...
2 identify and describe protons, neutrons and electrons in terms of their relative charges and relative masses 3 understand the terms atomic and proton number; mass and nucleon number 4 describe the distribution of mass and charge within an atom 5 describe the behaviour of beams of protons, neu...
The atomic mass refers to the sum of the atom's protons, neutrons, and electrons, whereas the mass number represents the sum of protons and neutrons. In other words, the main difference between the two concepts is that the atomic mass considers electrons. What’s the atomic mass of carbon...
Atomic Number and Mass Number Overview:Atoms are the building block of matter, and they combine in numerous forms to form different substances. You must be well aware that all the atoms consist of electrons, protons, and neutrons. But did you know how the presence of these subatomic particles...
What Is Atomic Mass? Atomic massis the sum of the masses of the protons, neutrons, and electrons in an atom, or the average mass, in a group of atoms. However, electrons have so much less mass than protons and neutrons that they don't factor into the calculation. So, the atomic mass...
AMU, it roughly reflects the sum of the number of protons and neutrons in the atomic nucleus (electrons have so much less mass that they are assumed to have a negligible effect). The symbol for the unit is u (unified atomic mass unit) or Da (Dalton), although AMU may still be used....
Number of neutrons=1−1=0Number of neutrons=1−1=0 Example 3: Complete the table below. Chemical SymbolAtomic NumberMass NumberNumber Of protonsneutronselectrons Fe 26 30 Y 89 39 30 65 Sn 50 69 Re 111 75 85 37 Te 52 76 Solution: Chemical SymbolAtomic NumberMass NumberNumber...
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 neutrons N. Isobar Member of a set of nuclides of the same atomic weight A. Isome...