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In 1808, scientists thought that substances like oxygen and hydrogen were elements, but they later discovered that these were compounds made up of different elements. One substance that was thought to be an element in 1808, but is actually a compound, is water (H2O).
An element is a substance in which all atoms are alike. Each element is made up of atoms with the same number of protons in their nucleus.
Chromium is a likeley element to be contained in a substance with a brilliant yellow color.
A one-element substance is a substance that is composed of only one type of atom. Examples include elemental gases like nitrogen or noble gases like helium.
A substance can be classified as an element, a compound, or a mixture. An element is a pure substance made up of only one type of atom, while a compound consists of two or more elements chemically bonded together. A mixture is a combination of two or more substances that are not chemically bonded.
An element is a pure substance that cannot be broken down into other substances by chemical means. Each element is made up of only one type of atom. Examples of elements include oxygen, carbon, and gold.