the mass number of an element is equal to
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- 1 The number of electrons in a neutral atom is equal to the number of protons. 2  The mass number of the atom (M) is equal to the sum of the number of protons and neutrons in the nucleus.  The number of neutrons is equal to the difference between the mass number of the atom (M) and the atomic number (Z).
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- Relative atomic mass. Relative atomic mass (symbol: Ar) is a dimensionless (number only) physical quantity. In its modern definition, it is the ratio of the average mass of atoms of an element in a given sample to one unified atomic mass unit. The unified atomic mass unit, symbol u, is defined being 1⁄12 of the mass of a carbon-12 atom.
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Atoms and elements The atomic mass is the number of portions and neutrons in an atom. Although all atoms of the same element have the same number of protons, they sometimes have more neutrons. Such atoms are called isotopes. For example, hydrogen has three isotopes. Most of the time a hydrogen atom has one proton and one neutron.
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General Biology/Print version The sum of the number of protons and neutrons in the atomic nucleus is called the atomic mass number. *Related Information: One element may exist as a mixture of atoms with … different numbers of neutrons. This is in contrast with, and often confused with, the atomic mass (as such, without number).aking the world better, one answer at a time. The sum of the number of protons and neutrons in the atomic nucleus is called the mass number. For example, Lithium has 3 protons and 4 neutrons in its nucleus. It's mass number is 7 (3+4).
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- Because the molar mass is a ratio of grams per. mole and Avogadro’s number is a ratio of. particles per mole, dividing the molar mass of an. element by Avogadro’s number yields the mass. of a single representative particle of that element.
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Relative atomic mass Relative atomic mass (symbol: Ar) is a dimensionless (number only) physical quantity. In its modern definition, it is the ratio of the average mass of atoms of an element in a given sample to one unified atomic mass unit. The unified atomic mass unit, symbol u, is defined being 1⁄12 of the mass of a carbon-12 atom.
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- The mass number of a nitrogen atom is determined by the mass of the nucleus. As it is the relative mass, it is equal to the combined number of protons and neutrons in the nucl … eus of the atom. For example, the most common isotope of nitrogen contains seven protons and seven neutrons, giving it a mass number of 14. Some atoms of nitrogen have an extra neutron, which gives a mass number of 15.
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- Sossusvlei Desert Lodge is set in the far northern part of the NamibRand Nature Reserve, a vast area of over 440 000 acres that lies between the endless dune fields of the Namib Desert and the jagged mountains of the escarpment.
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Chemistry A chemical element is a pure substance which is composed of a single type of atom, characterized by its particular number of protons in the nuclei of its atoms, known as the atomic number and represented by the symbol Z. The mass number is the sum of the number of protons and neutrons in a nucleus. Although all the nuclei of all atoms belonging to one element will have the same atomic number, they may not necessarily have the same mass number; atoms of an element which have different mass numbers are known as isotopes.
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- The count of neutrons and protons equals the mass number for an atom. This has its origin in the fact that the massive particles in the atom are protons and neutrons. The symbol for mass number is A. The entries in the periodic table do not show the mass numbers for atoms.
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ATOMS  The sum of the protons and neutrons in an atom is called mass number, and is represented by. symbol A.  Atoms of the same element (same atomic number) can possess different number of neutrons. (different mass numbers) and are called isotopes.
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- The mass number is the sum of protons and neutrons in the atomic nucleus of chemical elements. All mass numbers are integers. The atomic weight is not an an integer because … is calculated taking in the account the isotopic composition of an element; also the mass excess has a role.
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- The atomic mass is determined by the number of protons and neutrons in the atom. For example, Oxygen has 8 protons (as seen by the atomic number) and 8 neutrons which gives oxygen an atomic mass of 16. However, different isotopes of oxygen (with a different amount of neutrons) can have different atomic masses.Answer #5). Atomic mass is an element's mass that is the sum of masses of protons and neutrons forming an element. The easiest way to determine the atomic mass is to look up in the periodic table. In a periodic table, the atomic masses increase as you go across the table.
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Atomic Number and Mass Number Atomic Number (Z) = Number of protons =Number of electrons. For example, an atom of magnesium contains 12 protons, therefore, its atomic number is 12. All the atoms of a particular element contain same number of protons in their nuclei. Therefore, all the atoms of an element have same atomic number.
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Atomic mass The atomic mass is the mass of an atom. Its unit is the unified atomic mass units where 1 unified atomic mass unit is defined as 1⁄12 of the mass of a single carbon-12 atom, at rest. For atoms, the protons and neutrons of the nucleus account for almost all of the mass, and the atomic mass measured in u has nearly the same value as the mass number. When divided by unified atomic mass units or daltons to form a pure numeric ratio, the atomic mass of an atom becomes a dimensionless value ...
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- An atom of Carbon has 6 protons and 6 neutrons, it is given an atomic mass of 12 a.m.u which makes each proton and neutron in the nucleus of any element contribute 1 a.m.u to the atom's atomic mass.Answer #5). Atomic mass is an element's mass that is the sum of masses of protons and neutrons forming an element. The easiest way to determine the atomic mass is to look up in the periodic table. In a periodic table, the atomic masses increase as you go across the table.
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- The mass number of an atom is equal to which of the following? a. the number of protons in the atom b. the number of neutrons in the atom c. the total number of protons and neutrons in the atom d. the total number of protons, neutrons and electrons in the atom. ____ 22.
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Difference between Atomic Mass and Atomic Number Element showing its atomic number and mass number. Atomic number is used to define the type of element a material or substance is. It is the number of protons present in an element’s nucleus. The atomic mass, on the other hand, is the number of both the protons and neutrons present in the nucleus of the element. Electrons do not usually weigh much, so the atomic mass is calculated by adding the number of protons to neutrons. It is also referred to as the atomic weight.
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The Mole and Atomic Mass Calculations and Chemical Equations. Atomic mass: Mass of an atom of an element, expressed in. atomic mass units. Atomic mass unit (amu): 1.661 x 10-24g. Atomic weight: Average mass of all isotopes of a given. element; listed on the periodic table. Example: Hydrogen atomic weight = 1.008 amu.
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Chemical element The mass number of an element, A, is the number of nucleons (protons and neutrons) in the atomic nucleus. Different isotopes of a given element are distinguished by their mass numbers, which are conventionally written as a superscript on the left hand side of the atomic symbol (e.g., 238 U).
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Molar Mass The mass of one mole of an element or compound is called its molar mass (symbol M). The molar mass of copper is 63.5 g mol -1. The molar mass of sodium hydroxide is 40 g mol -1. There is a quantity that relates to the number of particles in a mass of substance. This quantity is called the amount of substance.
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Chemistry Lesson: Average Atomic Mass Calculations The atomic mass is an experimental number determined from all of the naturally occuring isotopes of an element. As we saw in our lesson on atomic structure, not all atoms of an element are identical. For example, hydrogen has three different isotopes that occur in nature – 1H, 2H, 3H.
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Glossary (Avogadro's Number) Atomic Number. The atomic number is equal to the number of protons in an atom's nucleus. The atomic number determines which element an atom is. For example, any atom that contains exactly 47 protons in its nucleus is an atom of silver.
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- The mass number of an isotope indicates the total number (the sum) of protons and netrons in an atom. The number of protons is determined by the atomic number. The number of neutrons can be found by subtracting the atomic number from the mass number. The mass number of an isotope indicates the total number (the sum) of protons and netrons in an atom. The number of protons is determined by the atomic number.
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Atom Atoms of the same element have the same number of protons, called the atomic number. Within a single element, the number of neutrons may vary, determining the isotope of that element. The total number of protons and neutrons determine the nuclide.ne mole of atoms of any element always has the same number of atoms (about 7023602200000000000♠6.022×1023). This number was chosen so that if an element has an atomic mass of 1 u, a mole of atoms of that element has a mass close to one gram.
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Atomic mass When divided by unified atomic mass units or daltons to form a pure numeric ratio, the atomic mass of an atom becomes a dimensionless value called the relative isotopic mass (see section below). Thus, the atomic mass of a carbon-12 atom is 12 u or 12 daltons (Da), but the relative isotopic mass of a carbon-12 atom is simply 12.