The protons and neutrons form the atom’s central nucleus. (The ordinary hydrogen atom is an exception; it contains one proton but no neutrons.) As their names suggest, protons have a positive electrical charge, while neutrons are electrically neutral—they carry no charge; overall, then, the...
Protons and neutrons have about the same mass. The protons are positively charged particles (+) and neutrons carry no charge. The electron is a negatively charged particle (-) with 1/840 the mass of a proton. Isotopes related practice Isotopes are the atoms of the same element that differ ...
解析 就是单数复数啦... 比如说proton就是一个质子,protons就是多个质子……氢就是one proton…… 在这几个词中,nucleus比较特殊.nucleus是单数,nuclei是复数【参见半径单数=radius复数=radii】 分析总结。 比如说proton就是一个质子protons就是多个质子
5An atom itself is a complete whole, with its electrons, protons and neutrons and other elements.原子本身是个整体，含电子、质子、中子以及其他组成部分。《柯林斯英汉双解大词典》6Each one is about the size of an atom.每一个都有一个原子的大小。7Any substance is made of atom. Whether it is ...
Matter has mass and takes up space. Atoms are basic building blocks of matter, and cannot be chemically subdivided by ordinary means. Atoms are composed of three type of particles: protons, neutrons, and electron. Protons and neutrons are responsible for most of the atomic mass, e.g in a ...
百度试题 结果1 题目The nucleus of an atom is _ of swiftly moving protons(质子)and neutrons(中子)that are bound together by very strong forces. A. consisted B. contained C. composed D. compressed相关知识点: 试题来源: 解析 C 反馈 收藏 ...
百度试题 结果1 题目The total number of protons and neutrons in an atom is calledA.the atomic numberB.the proton numberC.the mass numberD.the neutron number 相关知识点: 试题来源: 解析 C 反馈 收藏
and neutrons (hydrogen has 0). An element can has different kinds of atom. In fact they have same no.s of electrons and protons but different no.s of neutron to form a new chemical characteristic. It's called isotope of a element. A mass of an atom is measured by the no...
Protons and neutrons are known collectively as nucleons. Neutrons have no charge and protons have a charge of +1 (that is, they are positively charged). Therefore the nucleus of an atom is positively charged. Or, if describing more than one atom, one would say that the nuclei (plural...
Answer to: The mass number of an atom depends primarily on the number of a. protons and neutrons. b. positrons. c. neutrons and electrons. d...