atoms scientific definition
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element Noun. 1. atom - (physics and chemistry) the smallest component of an element having the chemical properties of the element. substance-the real physical matter of which a person or thing consists; DNA is the substance of our genes.
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Atomic theory Atomic theory. The current theoretical model of the atom involves a dense nucleus surrounded by a probabilistic cloud of electrons. In chemistry and physics, atomic theory is a scientific theory of the nature of matter, which states that matter is composed of discrete units called atoms. It began as a philosophical concept in ancient Greece and entered the scientific mainstream in the early 19th century when discoveries in the field of chemistry showed that matter did indeed behave as if it were made up of atoms. The word atom comes from the Ancient Greek adjective atomos, meaning indivisible. 19th century chemists began u
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What is Atom The smallest particle of an element that retains any of the properties of the element. chemed.chem.purdue.edu/genchem/glossary/a.html. A basic unit of matter. It is the smallest particle of an element that still has the characteristics of that element. Every atom has a positively charged central nucleus, surround by a number of negatively charged electrons. More about atoms...
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Atoms and elements Atoms are very, very small. A molecule is formed when atoms join together by chemical bonds. There are over a hundred different types of atom, called elements. The atoms of a particular element are identical to each other. They cannot be changed chemically into any different element.
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Atom Atom, smallest unit into which matter can be divided without the release of electrically charged particles. It also is the smallest unit of matter that has the characteristic properties of a chemical element. As such, the atom is the basic building block of chemistry. Most of the atom is empty space.
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Atomic Structure Atoms are tiny units of matter. All matter are made up of matter that occupies space and is made up of atoms. Atoms are the smallest particle of an element that can join up in whole numbers to form molecules.toms are tiny units of matter. All matter are made up of matter that occupies space and is made up of atoms. Atoms are the smallest particle of an element that can join up in whole numbers to form molecules.
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- 1 An atom is the smallest indivisible particle of an element which can take part in a chemical change. 2  Atoms can neither be created nor destroyed in a chemical reaction. 3  Atoms of the same element are identical in all respects, having the same size, shape and structure, and especially mass.
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What is An Atom? - Definition & Examples Most of the atom is empty space-both the nucleus and the electrons are so tiny that even solid objects are mostly empty. Protons are stable subatomic particles, with a positive +1 charge and a mass of approximately one atomic mass unit.
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- Atoms and Elements. Ordinary matter is made up of protons, neutrons, and electrons and is composed of atoms. An atom consists of a tiny nucleus made up of protons and neutrons, on the order of 20,000 times smaller than the size of the atom. The outer part of the atom consists of a number of electrons equal to the number of protons, making the normal atom electrically neutral. A chemical element consists of those atoms with a specific number of protons in the nucleus; this number is called the atomic number. The atoms of an element may differ in the number of neutrons; atoms with different neutron numbers are said to be different isotopes of the element.
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chemistry chemistry definition The study of the composition, properties, and reactions of matter, particularly at the level of atoms and molecules. The New Dictionary of Cultural Literacy, Third Edition
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Molecule Definition By Anne Marie Helmenstine, Ph.D. Molecule Definition: a molecule refers to two or more atoms which have chemically combined to form a single species. Examples: Examples of molecules include water H 2 O, oxygen, gas, O 2.olecule Definition: a molecule refers to two or more atoms which have chemically combined to form a single species.
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- Atom Definition. Chemistry Glossary Definition of Atom. This is a basic diagram of an atom, with protons, neutrons and electrons labeled. AhmadSherif, Wikipedia Commons. Anne Marie Helmenstine, Ph.D.
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- Atoms are the building blocks of matter. They are the smallest particles of an element that still have the element’s properties. Elements are pure substances—such as nickel, hydrogen, and helium—that make up all kinds of matter. All the atoms of a given element are identical in that they have the same number of protons, one of the building blocks of atoms.
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molecule A molecule is the smallest particle in a chemical element or compound that has the chemical properties of that element or compound. Molecules are made up of atom s that are held together by chemical bonds. These bonds form as a result of the sharing or exchange of electron s among atoms. The atoms of certain elements readily bond with other atoms to form molecules. Examples of such elements are oxygen and chlorine. The atoms of some elements do not easily bond with other atoms. Examples are neon and argon. Molecules can vary greatly in size and complexity. The element helium is a one-atom molecule. Some molecules consist of two atoms of the same element. For example, O 2 is the oxygen molecule most commonly found in the earth's atmosphere; it has two atoms of oxygen.
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CHEMISTRY I: ATOMS AND MOLECULES The atomic number is the number of protons an atom has. It is characteristic and unique for each element. The atomic mass (also referred to as the atomic weight) is the number of protons and neutrons in an atom. Atoms of an element that have differing numbers of neutrons (but a constant atomic number) are termed isotopes.
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Chapter Two Review Atoms are composed of more or less identical particles or building blocks, called elements. Atoms of any given element will differ from those of all other elements and provide its unique physical and chemical properties. Atoms are composed of more or less identical particles or building blocks, called elements.
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Matter A definition of matter based on its physical and chemical structure is: matter is made up of atoms. As an example, deoxyribonucleic acid molecules (DNA) are matter under this definition because they are made of atoms.
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Chemistry : Atoms, Molecules, Elements and compounds A compound is formed when atoms or molecules of different elements combine. In a compound, elements are chemically combined in a fixed proportion. Examples: 1  Hydrogen and oxygen are combined in a fixed proportion of 2:1 to form the compound water [H 2 O]. Since atoms are electrically neutral, the number of protons equal the number of electrons in an atom. 2  Atomic weight (or relative atomic mass) of an element is the number of times an atom of that element is heavier than an atom of hydrogen. 3  The atomic weight of hydrogen is taken to be unity [1].
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Atoms combine to form what? An atom is a life giving particle, with which you can combine to form various other types of solids, liquids or gases. When atoms or elements combine, they are called molecules. When molecules combine they form compounds. Elements is just another fancy way of saying ‘one single atom’.
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Early Ideas about Matter: From Democritus to Dalton Atoms: A single unit of an element is called an atom. The atom is the most basic unit of matter, which makes up everything in the world around us. Each atom retains all of the chemical and physical properties of its parent element.
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chemistry A) Each element is composed of tiny indestructible particles called atoms. B) All atoms of a given element have the same mass and other properties that distinguish them from the atoms of other elements. C) Atoms combine in simple, whole-number ratios to form compounds. D) Most of the atom's mass and all of its positive charge is contained in a small core called the nucleus.
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Matter: Definition & the Five States of Matter Physical science, which includes chemistry and physics, is usually thought of as the study of the nature and properties of matter and energy in non-living systems. Matter is the “stuff” of the universe — the atoms, molecules and ions that make up all physical substances. Matter is anything that has mass and takes up space. Energy is the capacity to cause change.
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What is Atomic Mass? - Definition & Examples Definition of Atomic Mass. Atoms are the basic units of matter. They are the smallest components of a chemical element, which is a substance that cannot be broken down into simpler material.
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- Dalton's Atomic Theory (1803) All matter is composed of extremely small particles called atoms. All atoms of a given element are identical in size, mass, and other properties. Atoms of different elements differ in size, mass, and other properties. Atoms cannot be subdivided, created, or destroyed.
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Dalton's Atomic Theory  (1803) Elements are composed of atoms, which are extremely small. All atoms of a given element have the same chemical properties and contain the same number of protons. Compounds are formed by the chemical combination of two or more different kinds of atoms. (Whole numbers only) Atoms are the units of chemical change.
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The Atom The Atom. The atom is the smallest unit of matter that is composed of three sub-atomic particles: the proton, the neutron, and the electron. Protons and neutrons make up the nucleus of the atom, a dense and positively charged core, whereas the negatively charged electrons can be found around the nucleus in an electron cloud.