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Types of Light Sources. There are countless sources of light, but they can all be categorized under either of the two following categories-Natural sources; Artificial sources; Natural Light Sources: The universe is filled with objects that emit light. Some light from these sources reaches the earth. The following things in nature have the ...
Compounds. A compound is a substance that contains atoms of two or more different elements, chemically joined together. For example, water is a compound of hydrogen and oxygen, chemically...
Most elemental symbols are relatively intuitive – H for hydrogen, He for helium, C for carbon, S for sulfur, etc. The symbols for some elements have their roots in Latin words and are less intuitive.
Interactive periodic table showing names, electrons, and oxidation states. Visualize trends, 3D orbitals, isotopes, and mix compounds. Fully descriptive writeups.
Topic 7Hd looks at the formation of compounds from elements and the difference in properties between elements and compounds. It also introduces ideas about naming simple compounds. Topic 7He reviews chemical reactions and applies them to thermal decomposition reactions. It also extends ideas about naming compounds and further develops the idea
Symbol of an element. Symbols represent elements, the first alphabet of their English or non-English name, written in capital letters. For example, C for carbon, O for oxygen, and H for hydrogen. Usually, another alphabet is also chosen from the element's name and written as a small letter, e.g., He for helium, Co for cobalt.
The elements in the human body are shown in Figure 2.1.1, beginning with the most abundant: oxygen (O), carbon (C), hydrogen (H), and nitrogen (N). Each element’s name can be replaced by a one- or two-letter symbol; you will become familiar with some of these during this course.
