how is the atomic mass number define?
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The mass number (symbol A, from the German word Atomgewicht [atomic weight]), also called atomic mass number or nucleon number, is the total number of protons and neutrons (together known as nucleons) in an atomic nucleus. ... The mass number is different for each different isotope of a chemical element.
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Atomic mass is the weighted average mass of an atom of an element based on the relative natural abundance of that element's isotopes. The mass number is a count of the total number of protons and neutrons in an atom's nucleus.
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The atomic number (number at the top) is the amount of protons and the amount of electrons. So if an element has an atomic number of 5, you know that it has 5 protons and 5 electrons. The atomic mass (number at the bottom) is the amount of protons and neutrons added together.
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atomic massThe average mass of an atom, taking into account all its naturally occurring isotopes. mass numberThe sum of the number of protons and the number of neutrons in an atom. atomic numberThe number of protons in an atom.
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What is the difference between an atom's atomic number and its mass number? Atomic number (Z) is the # of protons in an atom, while the mass number (A) is the total # of protons and neutrons in an atom. ... Because the # of protons does not change for each element.
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The atomic mass of an element is the total number of protons and neutrons in the nucleus of the atom. The mass number is used to calculate the number of neutrons & electrons in one atom of an element. In order to calculate the number of neutrons you must subtract the atomic number from the atomic mass.
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Each atom also has a mass number, denoted by the symbol A. The mass number of an atom is equal to the number of protons plus the number of neutrons that it contains. In other words, the number of neutrons in any atom is its mass number minus its atomic number.
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Atomic number is the fundamental properties of an atom. Every atom is identified by its unique atomic number. Atomic number is denoted by 'z'. Atomic number is equal to the number of protons present in an atom.
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Atomic number and mass number The total number of protons and neutrons in an atom is called its mass number.
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Mass number. The mass number of an atom is its total number of protons and neutrons. Atoms of different elements usually have different mass numbers , but they can be the same. For example, the mass number of argon atoms and calcium atoms can both be 40.
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An atomic mass unit is defined as a mass equal to one twelfth the mass of an atom of carbon-12. The mass of any isotope of any element is expressed in relation to the carbon-12 standard. For example, one atom of helium-4 has a mass of 4.0026 amu.
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The relative atomic mass of an element is a weighted average of the masses of the atoms of the isotopes. ... They have the symbol A r. Take care not to confuse mass numbers and relative atomic masses: mass numbers are always whole numbers (protons or neutrons cannot be split into parts)
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Atomic mass is also known as atomic weight. Atomic mass is the weighted average mass of an atom of an element based on the relative natural abundance of that element's isotopes. The mass number is a count of the total number of protons and neutrons in an atom's nucleus.
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The mass number of an isotope is the total number of protons and neutrons in an atomic nucleus. ... If the nucleus has 6 protons and 7 neutrons, then its mass number is 13. The symbol for an isotope lists the mass number as a superscript at the upper left. Thus, ₆¹²C represents a carbon isotope with mass number 12.
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Atomic mass (ma) is the mass of an atom. A single atom has a set number of protons and neutrons, so the mass is unequivocal (won't change) and is the sum of the number of protons and neutrons in the atom. ... Atomic weight is a weighted average of the mass of all the atoms of an element, based on the abundance of isotopes.
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The number of protons within the atom's nucleus is called atomic number and is equal to the number of electrons in the neutral (non-ionized) atom. Each atomic number identifies a specific element, but not the isotope; an atom of a given element may have a wide range in its number of neutrons.
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Mass number. The mass number of an atom is its total number of protons and neutrons. Atoms of different elements usually have different mass numbers , but they can be the same.