Matter(物质)分为Pure Substance (纯净物)与Mixture (混合物): Pure Substance(纯净物)有固定的化学式,只有一种组成成分的物质,分为由单种Element(元素)组成的单质和由多种Element(元素)化合成的化合物。 Mixture(混合物)是由多种成分(也即多种Pure Substance纯净物)组成的物质,也因此没有固定的化学式。混合物...
Elements are all around us. Iron is one of the commonest elements found within the Earth. You probably know the element oxygen. It is the element that we b (2) in all the time. And elements can combine (结合) to make new things l (3) H2O. This is hydrogen and oxygen put together...
78.1. THE PERIODIC TABLE 元素周期表 (图片可点击放大) In this section, we will explore the periodic table, which organizes chemical elements and provides valuable information about their properties and relationships. Understanding the periodic...
Let’s Begin… The team at periodicvideos has created a TED-Ed Lesson for every element of the periodic table. This one is about oxygen - it's number 8 and is among the most "famous" of the elements. Watch Think Dig Deeper Discuss …And Finally Customize this lesson 38 Create...
example,carbon atomsalways have six protons;hydrogen atomsalways have one; andoxygen atomsalways have eight. Different versions of the same element, called isotopes, can have a different number of neutrons. Elements can also gain or lose electrons to become charged, in which case they are called...
The Periodic Table of Elements 1 HYDROGEN H 1 7 6 4 BERYLLIUM 3 LITHIUM Li 23 Be 9 24 CARBON C 12 23 Atomic Number = Number of Protons = Number of Electrons Chemical Symbol Chemical Name Atomic Weight = Number of Protons + Number of Neutrons* 5 6 2 BORON B 11 27 CARBON C 12 28...
Periodic table of elements with information on chemical elements like gold, silver, iron, neon, helium, chlorine, copper, cobalt, and more
ED Periodic Table 化学元素周期表 (英文) 下载积分: 100 内容提示: The Modern Periodic Table of the Elements 1 18 Hydrogen 1 H 1.01 2.1 2 13 14 15 16 17 Helium 2 He 4.00 --- Lithium 3 Li 6.94 1.0 Beryllium 4 Be 9.01 1.5 Average relative masses are 2001 values, rounded to two ...
Get facts on the chemical and physical properties of the element oxygen, element 8 on the periodic table with symbol O.
1. The Elements and The Periodic Table元素和周期表The number of protons in the nucleus of an atom is referred to as the atomic