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...
The atomic number (原子序数) is equal to the number of electrons per atom or, what is equivalent, the number of protons (质子) per nucleus.相关知识点: 阅读 文言文阅读 文言题类 文言文阅读——翻译 试题来源: 解析 [答案]原子序数等于每个原子的电子数或者相当于每个原子核的质子数。反馈...
atomic number = number of protons atomic number = number of electrons number of protons = number of electrons Electrons! As atomic number increases by one, the number of electrons also increases by one. This means that the elements in the periodic table are also arranged in order of the ...
Atomic Number: Atoms are made up of protons, neutrons, and electrons. The protons and neutrons are found in the nucleus of the atom, while the electrons are outside the nucleus. The atomic number is the number of protons, while the mass number is the number of protons and neutrons. If ...
Is the mass number the number of protons?Atomic Structure:The structure of atoms is made of subatomic particles. There are three main types, protons, neutrons and electrons. Protons and neutrons make up the nucleus and electrons orbit them in a cloud....
【答案】(a)Electron(b)Neutron(c)①Thenumberofprotonsisnotequaltothenumberofneutrons.②Thenumberofelectronsisnotequaltothenumberofprotons.③Thetotalnumberofparticlesisnot 20.④Thenumberofneutronsisnotequaltotheatomicnumber.【解析】(a)原子的质子数等于原子序数,题目中要求的是质量最小的粒子,所以是电子,故...
All the atoms of an element have the same atomic number. You will remember that the atomic number is the number ofprotons(= very very small pieces of matter that carry positive orÅelectricity) in the nucleus or centre of an atom, and this number determines or decides the nature of the...
In the planetary model of atomic structure, an atom consists of a heavy, positively charged nucleus surrounded by a cloud of much lighter, negatively charged electrons. Protons supply the positive charge, and each element has a different number of them. The number of protons in the nucleus dete...
Both the protons and neutrons reside in the nucleus. Protons have a postive (+) charge, neutrons have no charge --they are neutral. Electrons reside in orbitals around the nucleus. They have a negative charge (-). It is the number of protons that determines the atomic number, e.g., H...
What is the atomic number?Atoms:Atoms are the basic unit of matter. Each atom has a dense nucleus composed of neutrons and protons. It also has a less dense outer electron cloud. Neutral atoms contain the same number of protons and electrons, which are positively and negatively charged, ...