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...
Are humans made of atoms? About 99 percent of your body is made up of atoms of hydrogen, carbon, nitrogen and oxygen. You also contain much smaller amounts of the other elements that are essential for life. ... The very heavy elements in you were made in exploding stars. The size of...
Living things, for example, are mostly made from the atoms carbon, hydrogen, and oxygen. These are just three of over 100 chemical elements that scientists have discovered. Other elements include metals such as copper, tin, iron and gold, and gases like hydrogen and helium. You can make ...
All lipids are made up of the same atoms: carbon (C), hydrogen (H) and oxygen (O). Lipids contain the same elements that make up carbohydrates but in different proportions. Lipids have a large proportion of carbon and hydrogen bonds and a small proportion of oxygen atoms. Although the st...
How many of each type of atom are there in the formula (NH4)2HPO44? How much does an electron weigh? What is the atomic mass of silicon? Which is a substance that is made up of only one type of atom? What mass of sodium metal contains the same number of ato...
What is the role of the oxygen atoms of the CuO chains in the high- T c superconductivity of YBa 2 Cu 3 O 7δ ?For the YBa 2 Cu 3 O 7 and YBa 2 Cu 3 O 6 systems ab initio Hartree-Fock cluster calculations have been performed using a self consistent Madelung potential for the ...
Atomsare the foundation of matter, which 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 ...
Gravity is a force that we experience every day, yet it remains somewhat of a mystery. It's the reason we stay grounded on Earth and why objects fall when dropped. Although there are several theories attempting to explain gravity, scientists still don't completely understand it. In this arti...
What is DNA made of? DNA is made up of molecules called nucleotides. Each nucleotide contains three components: a phosphate group, which is one phosphorus atom bonded to four oxygen atoms; a sugar molecule; and anitrogenbase. The four types of nitrogen bases are adenine (A), thymine (T)...
A silicone compound is made up of a hydrophobic particle dispersed in silicone oil, which produces a foam control used in a great variety of applications.