Atomic number, the number of a chemical element in the periodic system, whereby the elements are arranged in order of increasing number of protons in the nucleus. Accordingly, the number of protons, which is always equal to the number of electrons in a n
英 na.【化】原子序数 网络原子数;原子序号;原子量 复数:atomic numbers 权威英汉双解 英汉 英英 网络释义 atomic-number n. 1. 原子序数(指原子在元素周期表中的序号)the number of protons in the nucleus (= centre) of an atom, which is characteristic of a chemical element. Elements are placed in...
Boron: Semimetallic chemical element, chemical symbol B,atomic number5. 硼: 半金属的化学元素, 化学符号b, 原子序数5. 期刊摘选 展开全部 英英释义 Noun 1. the order of an element in Mendeleyev's table of the elements; equal to the number of protons in the nucleus or electrons in the neutral...
Atomic number and mass number：原子数和质量数 AtomsandElements TheAtomAtomicNumberandMass NumberIsotopes LecturePLUSTimberlake 1 AtomicTheory AtomsarebuildingblocksofelementsSimilaratomsineachelementDifferentfromatomsofotherelementsTwoormoredifferentatomsbondin simpleratiostoformcompounds LecturePLUSTimberlake 2 Subat...
outsidenucleus ProtonNeutron p+n +0 11 nucleus nucleus LecturePLUSTimberlake 3 LocationofSubatomicParticles electrons protons nucleus neutrons LecturePLUSTimberlake 4 AtomicNumber Countsthenumberofprotonsinanatom LecturePLUSTimberlake5 AtomicNumberonthePeriodicTable ...
What is the mass number of an atom with 5 protons and 7 neutrons? What is the atomic mass of an electron? What is the atomic mass number of carbon-13? If an atom has an atomic number of 8, how many protons will it have?
A. The number of protons B. The number of neutrons C. The number of electrons D. The sum of protons and neutrons 相关知识点: 试题来源: 解析 A。原子序数由质子数决定。选项 A 正确,原子序数等于质子数。选项 B 中子数不能决定原子序数。选项 C 电子数在原子呈电中性时等于质子数,但不是决定原...
Atomic number (the number of protons in the nucleus), not atomic mass number (the number of protons and neutrons), determines chemical behavior. 子句类型: 宾语从句 连接词: THAT 3. 句子成分 主句 We [主语] now [状语] know [谓语] something. [宾语] 分句-1 Atomic number (the number...
What is the definition of an atomic number? An atomic number of an element is the number of protons in all the atoms of that element. Atomic numbers are always whole numbers greater than zero, such as 1,2,3... since an atom cannot have a fractional number of protons. What is the di...
Atomic number and mass number：原子数和质量数共24页文档 AtomsandElements TheAtomAtomicNumberandMass NumberIsotopes LecturePLUSTimberlake 1 AtomicTheory AtomsarebuildingblocksofelementsSimilaratomsineachelementDifferentfromatomsofotherelementsTwoormoredifferentatomsbondin simpleratiostoformcompounds L...