A. A very small particle that makes up matter B. A large object in space C. A form of energy D. A type of wave 相关知识点: 试题来源: 解析 A。“Atom”在科学中意为“原子”,是构成物质的非常小的粒子;B 选项“a large object in space”指“太空中的大物体”;C 选项“a form of energ...
Most of an atom is empty space. If an atom were about as big as a baseball stadium, the nucleus would be the size of a pea in the very center and the electrons would be somewhere on the outside edge.What makes an atom of gold different from an atom of iron is the number of ...
What is an oxygen-18 atom? What value is closest to the mass of the atom? Describe the atomic structure of the atom and its subatomic particles. What two particles make up the mass of an atom? Which of the three subatomic particles has the smallest mass?
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Zooming in on the fragments of the cup,we see molecules, made of atomsbound up together.A molecule is the smallest unit of any chemical compound.An atom is the smallest unit of any element in the periodic table.But the atom is not the smallest unit of matter.Experiments found that each ...
consists of identifying all the subatomic particles that are thought to make up an atom, but investigating the forces that govern them. These include strong nuclear forces, weak nuclear forces, electromagnetism and gravity. Here is a breakdown of all that we've come to learn about the atom so...
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What Is an Atom in Chemistry? In the world of chemistry, an atom is matter, which makes up everything that is tangible (items you can touch) in the world. One important property of an atom is that it can't be broken down any further with any type of chemical means because it is ...
The majority of an atoms’ mass comes from the protons and neutrons that make up its nucleus. Electrons are the least massive of an atom’s constituent particles, with a mass of 9.11 x 10-31kg and a size too small to be measured by current techniques. Protons have a mass that is 1,...
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 a new element, while adding a neutron makes an isotope, or heavier version, of that atom. ...