![]() A molecule is a substance that contains two or more atoms chemically joined, such as Math Processing Error A compound is a substance that is made up of two or more different elements that are chemically joined. For example, the element sodium is made up of only sodium atoms. If water is a molecule, is it also a compound because the hydrogen and oxygen have been chemically combined? If so. An element is a substance that is made entirely of one type of atom. ![]() What is an element? How many elements are there? Salt (NaCl) is an ionic compound because it is a substance made from more than one kind of element that is held together with ionic bonds. Water (H 2O) is a molecular compound because it is a substance made from more than one kind of element that is held together with molecular bonds. Nitrogen gas (N 2) is a molecule because the bond between the nitrogen atoms is a molecular bond. In general, electrons can be shared between atoms (a molecular bond) or electrons can be completely removed from one atom and given to another (an ionic bond). Whether something is a molecule or not depends on the type of bond that is formed when its atoms join together. Atoms are the smallest units of elements that still retain the elements properties. For example, H 2 O symbolizes a compound called water composed of hydrogen (H) and oxygen (O) atoms in a 2:1 ratio. Elements are pure substances with specific properties. In chemistry, a compound is a substance created when atoms from chemical elements join together. Just as the structure of the atom is held together by the electrostatic attraction between the positively charged nucleus and the negatively charged electrons surrounding it, the stability within chemical bonds is also due to electrostatic attractions. Things like nitrogen gas (N 2) and buckminsterfullerene (C 60) are not compounds since they only contains one kind of element (nitrogen gas contains only nitrogen and buckminsterfullerene contains only carbon). The symbol of a compound is a combination of its constituent elements with a subscript to the right of the element symbol representing the whole number ratio of the atoms of the element in the compound. A compound is a distinct group of atoms held together by chemical bonds. ![]() They are compounds because they each contain more than one kind of element. Water (H 2O), table salt (NaCl), carbon dioxide (CO 2), methane (CH 4) and chlorophyll (C 55H 72O 5N 4Mg) are a few examples of compounds. Elements and compounds are both examples of pure substances. Mixtures can be classified as homogeneous or heterogeneous. Mixtures are physical combinations of two or more elements and/or compounds. What is the difference between a compound and a molecule?Ī compound is a substance that is composed from two or more different elements. A pure substance is a form of matter that has a constant composition and properties that are constant throughout the sample.
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