![]() ![]() Thus hydrogen and oxygen may be present in any arbitrary proportions in mechanical mixtures but when sparked will combine only in definite proportions to form the chemical compound water (H 2O). It is this feature that distinguishes chemical compounds from solutions and other mechanical mixtures. The ratio of the numbers of atoms that can be bonded together to form molecules is fixed for example, every water molecule contains two atoms of hydrogen and one atom of oxygen. Polymer molecules may contain many thousands of component atoms. Molecules containing more than two atoms are termed polyatomic molecules, e.g., carbon dioxide (CO 2) and water (H 2O). If the two atoms are identical, as in, for example, the oxygen molecule (O 2), they compose a homonuclear diatomic molecule, while if the atoms are different, as in the carbon monoxide molecule (CO), they make up a heteronuclear diatomic molecule. Diatomic molecules contain two atoms that are chemically bonded. Thus, from a structural point of view, a molecule consists of an aggregation of atoms held together by valence forces. If this interaction is such that the total energy of the system is lowered, then the atoms bond together to form a molecule. When atoms approach one another closely, the electron clouds interact with each other and with the nuclei. SpaceNext50 Britannica presents SpaceNext50, From the race to the Moon to space stewardship, we explore a wide range of subjects that feed our curiosity about space!Ītoms consist of a single nucleus with a positive charge surrounded by a cloud of negatively charged electrons.Learn about the major environmental problems facing our planet and what can be done about them! Saving Earth Britannica Presents Earth’s To-Do List for the 21st Century.Britannica Beyond We’ve created a new place where questions are at the center of learning.100 Women Britannica celebrates the centennial of the Nineteenth Amendment, highlighting suffragists and history-making politicians.COVID-19 Portal While this global health crisis continues to evolve, it can be useful to look to past pandemics to better understand how to respond today.Student Portal Britannica is the ultimate student resource for key school subjects like history, government, literature, and more.This Time in History In these videos, find out what happened this month (or any month!) in history.#WTFact Videos In #WTFact Britannica shares some of the most bizarre facts we can find.Demystified Videos In Demystified, Britannica has all the answers to your burning questions.Britannica Explains In these videos, Britannica explains a variety of topics and answers frequently asked questions.Britannica Classics Check out these retro videos from Encyclopedia Britannica’s archives. ![]()
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