A. Silicon atoms. B. Carbon atoms. C. Oxygen atoms. D. Hydrogen atoms. 相关知识点: 试题来源: 解析 B。解析:文章中明确提到“Graphene is an extremely thin and strong material. It is made up of a single layer of carbon atoms arranged in a hexagonal lattice.”,石墨烯是由一层碳原子组成...
Every element is made of atoms- piles of paper clips. All atoms of any element are the same- all the paper clips in the pile are the same size and color. Atoms of different elements are different (size, properties)- like different sizes and colors of paper clips. Atoms of different ele...
C. Three hydrogen atoms and one oxygen atom. D. One hydrogen atom and three oxygen atoms. 相关知识点: 试题来源: 解析 B。中文解析:文章中明确提到“Water is a compound made up of two hydrogen atoms and one oxygen atom.”,所以水是由两个氢原子和一个氧原子组成。
is everything that makes up the universe around us. Each kind of atom makes up a pure substance called an element. You may have heard of oxygen, lead, and gold. Well, these are all examples of elements. Can you believe that a pure gold necklace is made up of billions of gold atoms...
Did you know that everything in the universe is made of matter, and all atoms are pieces of matter? So, anything you can touch is made of atoms, even your body. You can learn all about atoms in chemistry. What Is an Atom in Chemistry?
If you keep taking things apart, you'll eventually, find that all matter (all the "stuff" that surrounds us) is made from different types of atoms. Living things, for example, are mostly made from the atoms carbon, hydrogen, and oxygen. These are just three of over 100 chemical ...
The human body contains around 20 different elements, mostly made inside ancient stars. If you deconstructed an 80kg human into atoms, you would get about the following amounts of the different elements: Oxygen – 52kg This element makes up more than half the mass of your body but only a...
In photosynthesis, what is the source of oxygen? A. water B. carbon dioxide C. sunlight D. chlorophyll 相关知识点: 试题来源: 解析 A。在光合作用中,氧气的来源是水(water)。二氧化碳(carbon dioxide)是光合作用的原料之一,但不是氧气的来源。太阳光(sunlight)是光合作用的能量来源。叶绿素(chlorophyll)...
An oxygen atom contains eight electrons, arranged into two orbital shells. Electron Situated within the two shells, these subatomic particles have a mass of almost zero and a charge of -1. Unpaired electron Two electrons in the outer shell don’t have a partner. This allows oxygen atoms to ...
The chemical structure of water makes it an excellent medium for life.Water is actuallyquite simple,bus the way the water molecule is formed gives water its unique properties.The water molecule is made up of two hydrogen atoms and ane oxygen atom.They form a polar...