Every atom is composed of anucleusand one or more electrons bound to the nucleus. The nucleus is made of one or more protons and a number of neutrons. Only the most common variety of hydrogen has no neutrons. More than 99.94% of an atom's mass is in the nucleus. ...
Protons and neutrons have approximately the same mass. However, one proton is about 1,835 times more massive than an electron. Atoms always have an equal number of protons and electrons, and the number of protons and neutrons is usually the same as well. Adding a proton to an atom makes ...
百度试题 结果1 题目A___ has taught us what atoms are made up of and how powerful the atom bomb is. A. seaman B. salesman C. naturalist D. scientist 相关知识点: 试题来源: 解析 D 反馈 收藏
百度试题 结果1 题目 249. A___ has taught us what atoms are made up of and how powerful the atom bomb is. A. seaman B. salesman C. naturalist D. Scientist 相关知识点: 试题来源: 解析 D 反馈 收藏
concept of the atom measurements of atomic mass repeating or periodic relationship between the elements Concept of the Atom From the ancient Greeks through today, we have pondered what ordinary matter is made of. To understand the problem, here is a simple demonstration from a book entitled"The...
What changes when an ion is made from an atom? A. the number of electrons only B. the number of neutrons only C. the number of protons only D. the number both of protons and of neutrons 相关知识点: 试题来源: 解析 A 考查实际运用。A. 仅电子数量(变化),B. 仅中子数量(变化),C. ...
Learn about atoms, the fundamental unit of matter in the universe. Discover the different parts of an atom, such as the nucleus, proton, neutron,...
Drill 1. What is the atom? 2. How did it evolve over time? Objective SWBAT: Describe the structure of atoms in order to indirectly determine the size and shape of an object. SAT/HSA Enrichment Some cells have many short, hairlike structures on their surfaces. These structures are used ma...
Atoms: Atoms are the purest form of matter. They consist of protons, neutrons, and electrons. The periodic table lists all of the different types of atoms that are known to exist and are known as elements. Answer and Explanation: An atom that has more protons than electrons is called a ...
A has taught us what atoms are made up of and how powerful the atom bomb is.A.seamanB.salesmanC.naturalistD.Scientist