what is a an atom
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- Atom definition, the smallest component of an element having the chemical properties of the element, consisting of a nucleus containing combinations of neutrons and protons and one or more electrons bound to the nucleus by electrical attraction; the number of protons determines the identity of the element. See more.
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What Is An Electron Easily put, an electron is a subatomic particle that carries a negative electric charge. There are no known components, so it is believed to be an elementary particle(basic building block of the universe). The mass of an electron is 1/1836 of its proton. Electrons have an antiparticle called a positron.
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- Unsourced material may be challenged and removed. (December 2007). An ion (/ˈaɪən, -ɒn/) is an atom or a molecule in which the total number of electrons is not equal to the total number of protons, giving the atom or molecule a net positive or negative electrical charge. Ions can be created, by either chemical or physical means, via ionization.
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Cushion Moss (Leucobryum) Prefers sandy soil, likes shade, but can tolerate partial sun. This moss is a lighter green color with a silvery-white cast to it. It grows in a round cushion shape, and is shipped in clumps. Cushion moss is shipped: By the Clump. Cushion moss is shipped as a mix of various sized clumps that combined total 5 square feet. These clumps vary in size betweem 4 x 4 to 12 x 12. We ship clumps in various sizes that make up each 5 square foot order. Clumps (2.5 sq.feet) $49.00 ea.
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- A unit of matter; the smallest unit of a chemical element. Each atom consists of a nucleus, which has a positive charge, and a set of electrons that move around the nucleus.
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Regulation of MPF activity in vitro One unit of MPF activity is defined as the amount of material in 50 nl that will induce 50GVBD in recipient oocytes (Wu and Gerhart, 1980). As shown in Figure 1, MPF activity remained undetectable (<15 unitslftl) in the extract for the first 15 min and then rose quickly to a peak of 90 unitslltl at 45 min.
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- A molecule is a particle containing two or more atoms. If it contains only one type of atom it is called an element. An exception to this is diatomic gases (for example: Oxygen, O 2, where the molecule contains two atoms of the same element, bonded covalently.
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Chemistry Atoms are the smallest particles of matter that can enter into chemical reactions. Elements are composed of atoms. Molecules are the smallest particles of matter that can have independent existence. Molecules can contain one atom, two atoms, or more than two atoms. Atomic number is the number of protons in the nucleus of an atom of an element. Mass number is the sum of the protons and the neutrons in the nucleus of an atom of an element.
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How is a atom different from an ion? An atom has an equal amount of Electrons and Protons, but an ion is a particle with an uneven amount of Protons and Electrons. A Cation, having more Protons than Electrons and an Anion, having more Electrons than Protons.
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Who Discovered the Atom? The atom is made up of several subatomic particles. These include the electron, neutron and the proton. The electron is the smallest of these particles and has a negative charge. It is so small it. cannot be measured yet. The proton has a positive charge and is 1,836 times bigger than the electron.
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What is an Electron? An electron is a subatomic particle with a negative electric charge that is equal, but opposite to, the positive charge of a proton.
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Atomic mass From Wikipedia, the free encyclopedia. An atomic mass (symbol: m a) is the mass of a single atom of a chemical element. It includes the masses of the 3 subatomic particles that make up an atom: protons, neutrons and electrons. Atomic mass can be expressed in grams. However, because individual atoms have very small masses, this is not very helpful.
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atom the smallest particle of an element that has all the properties of the element. There are two main parts of an atom: the nucleus and the electron cloud.
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atom by Jerry Coffey on February 17, 2010. The atom definition is: A unit of matter, the smallest unit of an element, having all the characteristics of that element and consisting of a dense, central, positively charged nucleus surrounded by a system of electrons.
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General Chemistry/Atoms and Molecules General Chemistry/Atoms and Molecules - Atoms. 1  An atom is the smallest unit of matter that has the properties of an element. 2  The nucleus, composed of protons and neutrons, is at the center of an atom. 3  The electron has an electric charge equal but opposite the proton (that is, they cancel).
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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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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. Shell atomic model.
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What is the Difference Between an Atom and an Ion? An atom is the smallest possible unit of an element. Atoms are considered to be the basic building blocks of matter because they cannot be divided into smaller particles by any chemical process. An atom consists of three types of subatomic particles: neutrons, protons, and electrons.
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What is an Atom? The number of protons in an atom defines what element it is. For example, carbon atoms have six protons, hydrogen atoms have one and oxygen atoms have eight. The number of protons in an atom is referred to as the atomic number of that element. The number of protons in an atom also determines the chemical behavior of the element.
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atom 1. the smallest component of an element having the chemical properties of the element, consisting of a positively charged nucleus of neutrons and protons that exerts an electrical attraction on one or more electrons in motion around it.
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What is an Atom? However, one proton weighs more than 1,800 electrons. Atoms always have an equal number of protons and electrons, and the number of protons and neutrons is usually the same as well. Adding a proton to an atom makes a new element, while adding a neutron makes an isotope, or heavier version, of that atom.rotons and neutrons are heavier than electrons and reside in the center of the atom, which is called the nucleus. Electrons are extremely lightweight and exist in a cloud orbiting the nucleus. The electron cloud has a radius 10,000 times greater than the nucleus.
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atom atom definition. A unit of matter; the smallest unit of a chemical element. Each atom consists of a nucleus, which has a positive charge, and a set of electrons that move around the nucleus. (See Bohr atom.) Note: Atoms link together to form molecules.
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Atom Every atom is composed of a nucleus and one or more electrons bound to the nucleus. The nucleus is made of one or more protons and typically a similar number of neutrons. Protons and neutrons are called nucleons. More than 99.94% of an atom's mass is in the nucleus.
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What is an Atom? 1 Atoms are made of extremely tiny particles called protons, neutrons, and electrons. 2  Protons and neutrons are in the center of the atom, making up the nucleus. 3  Electrons surround the nucleus. 4  Protons have a positive charge.  Electrons have a negative charge.
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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.