Chemistry - atoms . Elements are substances made up of only...

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Chemistry Matter Matter occupies space and has weight. It can exist as a solid, liquid, or gas. It may be possible to break some kinds of matter down into other kinds of matter with different properties. For example, water (H 2 O) can be broken down into hydrogen and oxygen. Hydrogen and oxygen in the above example cannot be broken down any further because they are elements . Elements Elements cannot be broken down into substances with different properties by chemical reactions. For example, water (H 2 O) is not an element because it can be broken down into hydrogen (H) and oxygen (O). Substances that are composed of two or more different elements are called compounds . For example, water is a compound because it is composed of hydrogen and oxygen. The smallest particles of an element that have the characteristics of that element are
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Unformatted text preview: atoms . Elements are substances made up of only one kind of atom. There are 92 naturally occurring elements. Matter is therefore composed of 92 different kinds of elements. The following elements make up 96% of the body weight of organisms: Oxygen, Carbon, Hydrogen, Nitrogen. Atoms An atom is composed of subatomic particles. Three important kinds of subatomic particles are protons, neutrons, and electrons. Some atoms (ex: hydrogen) do not have neutrons. Protons and neutrons are located in a central area called the nucleus. Electrons move about the nucleus. The number of electrons is equal to the number of protons. It is more accurate to represent the space occupied by electrons as a cloud. The electrons are likely to be located somewhere within the cloud....
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Chemistry - atoms . Elements are substances made up of only...

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