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    the element or compound chemistry
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  1. Elements and compounds are pure chemical substances found in nature. The difference between an element and a compound is that an element is a substance made of same type of atoms, whereas a compound is made of different elements in definite proportions.

  2. 4 Ιαν 2024 · element vs. compound. An element is a substance that cannot be separated into simpler substances by chemical means. An element consists of an atom with a unique combination of protons, neutrons, and electrons. For example, the element hydrogen has one proton, one neutron, and one electron.

  3. A compound is a substance that contains two or more elements chemically combined in a fixed proportion. The elements carbon and hydrogen combine to form many different compounds. One of the simplest is called methane, in which there are always four times as many hydrogen particles as carbon particles.

  4. en.wikipedia.org › wiki › HeliumHelium - Wikipedia

    Scientific discoveries. The first evidence of helium was observed on August 18, 1868, as a bright yellow line with a wavelength of 587.49 nanometers in the spectrum of the chromosphere of the Sun.

  5. 12 Ιουλ 2023 · Identify every element in the condensed structural formula and then determine whether the compound is organic or inorganic. As appropriate, use either organic or inorganic convention to list the elements.

  6. 22 Αυγ 2019 · An element is the simplest form of matter that has a unique set of properties. One element cannot be chemically converted to another element. A compound is a substance that contains two or more elements chemically combined in a fixed proportion.

  7. education.nationalgeographic.org › resource › resource-library-elements-and-compoundsElements and Compounds - Education

    Elements and Compounds. An element is a substance that cannot be broken down into a simpler format. They are distinguished by a unique atomic number. The elements are organized by their atomic number in the periodic table, which highlights elements with similar properties. Water is an example of a compound, a mixture of two or more elements ...

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