atomic number is equal to what
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Atomic Number and Mass Number The atomic number of an element is equal to the number of protons in the nucleus of its atom. The atomic number is also known as proton number of the element. Further, in an atom, number of protons is equal to the number of electrons. Hence, atomic number is also equal to the number of electrons in an atom of the element. Thus,
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How would you find the atomic number, atomic mass, protons, neutrons and electrons for ions and isotopes? Is it similar? First, you must find the element in the Periodic Table. All Periodic Tables give at least the symbol and the atomic number of the element. We see that for mercury the atomic number is 80. The atomic number is the number of protons in an atom's nucleus, so we can tell right away that an atom of mercury contains 80 protons. The mass number (201) is the total number of protons and neutrons. So, there must be 201 - 80 = 121 neutrons.
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Why is the number of protons and electrons equal in an atom? Actually the proton and electron count of an atom are equal only when the atom is neutral in charge. The three atomic particles of an atom are the protons, which carry a positive charge, the electrons which carry a negative charge and the neutrons which have no charge.
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atomic number atomic number - the order of an element in Mendeleyev's table of the elements; equal to the number of protons in the nucleus or electrons in the neutral state of an atom of an element. number - a concept of quantity involving zero and units; every number has a unique position in the sequence.
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- A: The atomic number of an atom is the number of protons that resides in the nucleus, while the mass number is the number of protons and neutrons combined. Th... Full Answer >
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- The sum of the number of protons and neutrons in the nucleus of an atom is called the mass number (A), or nucleon number. For isotopes of an element, the mass number is always different (because the number of neutrons changes and neutrons contribute to the mass number).or example, the number of protons in any atom of hydrogen is 1, and the number of protons in any atom of helium is 2. The number of protons in the nucleus of an atom is called its atomic number (Z), which identifies the atom.
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Why is the number of protons and electrons equal in an atom? The proton number is always the same as the atomic number for the element. The protons and neutrons are found in the nucleus of the of the atom and make up the major it of the mass of the atom. The electrons are found in orbitals surrounding the nucleus. In order for the atom to remain electrically neutral the protons and electrons must balance each other.
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Atoms, Isotopes, Ions, and Molecules (A) atoms contain equal numbers of protons and neutrons (B) the mass of an atom is equal to the number of protons + the number of electrons (C) neutrons have a mass of 0 and a charge of 1 (D) to calculate the number of neutrons in an atom, use the mass in the periodic table (E) the atomic number is the number of electrons in an atom
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Atomic Mass For any given isotope, the sum of the numbers of protons and neutrons in the nucleus is called the mass number. This is because each proton and each neutron weigh one atomic mass unit (amu). By adding together the number of protons and neutrons and multiplying by 1 amu, you can calculate the mass of the atom.
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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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atomic number Scientists use the term atomic number to describe the number of protons in one atom of an element. For example, the atomic number of hydrogen is 1. It lists every chemical element and each element's atomic number. Just by looking at the table, you can see that the atomic number of oxygen is 8 — this means that there are eight protons in one atom of oxygen.
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- For every isotope of an element the number of protons in the nucleus is always constant. For example, the number of protons in any atom of hydrogen is 1, and the number of protons in any atom of helium is 2. The number of protons in the nucleus of an atom is called its atomic number (Z), which identifies the atom.or example, the number of protons in any atom of hydrogen is 1, and the number of protons in any atom of helium is 2. The number of protons in the nucleus of an atom is called its atomic number (Z), which identifies the atom.
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- Posted on October 13, 2010 at 7:56 AM. The key to this is first to understand that in a neutral atom, the number of positive protons and negative electrons is always equal. Secondly, the number of protons is always the atomic number of the element and uniquely identifies the element. because of the existance of isotopes for all elements, the number of neutrons will vary and cannot be used by itself to determine the identity of the element. That being said, for a)...
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The atomic number of an element determines its? Report Abuse. Atomic Number The number of protons always equals the number of electrons in an atom, and that number is equal to the atomic number. For instance, carbon has an atomic number of six and therefore has six protons and six electrons.
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Question Bank Topic 2 The number of protons in the nucleus of the atom is equal to the atomic number (Z). The number of electrons in a neutral atom is equal to the number of protons. 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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Mass number Thus the atomic number increases by 1 (Z: 6→7) and the mass number remains the same (A = 14), while the number of neutrons decreases by 1 (N: 8→7). The resulting atom is nitrogen-14, with seven protons and seven neutrons:
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ATOMS Again, mass number and atomic mass are two very different things, that happen to approximately correspond. Mass number is simply the number of nuclear particles (protons and neutrons). Atomic mass is the actual mass of the atom. Keep in mind that protons and neutrons do not have masses of exactly one amu. Even if they did, the mass of the nucleus is not the sum of the masses of the nuclear particles. There is only one isotope of one element for which the mass number and atomic mass are exactly the same. That is carbon-12, and happens because the amu is defined as 1/12 of the mass of a carbon-12 atom.
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Protons, Neutrons, Electrons?!? Report Abuse. The number of protons and electrons (in a neutral atom) are equal to the atomic number of the atom. For example in a, the number of protons and electrons in magnesium is 12. To find neutrons, you take the atomic mass of the atom and subtract the number of protons.For Magnesium, you subtract 12 from 25 to find the number of neutrons, which in this case is 13.he number of protons and electrons (in a neutral atom) are equal to the atomic number of the atom. For example in a, the number of protons and electrons in magnesium is 12.
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Atomic mass 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. Instead, atomic mass is expressed in unified atomic mass units (unit symbol: u). 1 atomic mass unit is defined as 1/12 of the mass of a single carbon-12 atom.
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Chemical element Whereas the mass number simply counts the total number of neutrons and protons and is thus a natural (or whole) number, the atomic mass of a single atom is a real number for the mass of a particular isotope of the element, the unit being u.
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Lesson 5: Atomic Structures The mass number is very close to the actual mass of the atom in amu but it is not exactly equal to the mass for three reasons: 1  The electrons, though very light, do weigh something. 2  The mass of the proton and the neutron aren’t exactly 1 amu. The proton weighs 1.0073 amu and the neutron weighs 1.0087 amu.
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- The atomic number of an atom is the number of protons it contains. All the atoms of a particular element have the same atomic number (number of protons). The atoms of different elements have different numbers of protons. For example, all oxygen atoms have 8 protons and all sodium atoms have 11 protons. The mass number of an atom is the total number of protons and neutrons it contains. The mass number of an atom is never smaller than the atomic number. It can be the same, but is usually bigger.
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Atomic Structure The number of protons in the nucleus is the atomic number of that atom. The atomic number represents the number of protons (+) and is equal to the number of electrons (-). The atomic number is equal to the number of protons in an atom's nucleus. The atomic number determines which element an atom is.
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Propulsion Generally, the number of electrons and the number of protons in an atom are equal to each other. When that happens,the atom is in a normal or neutral state. An entire atom becomes electrically charged when the number of electrons or protons stops being equal. The extra electron or proton isn't balanced by something inside the atom anymore and begins to be attracted to the protons or electrons in other atoms.
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The mass number of an element is equal to? Atomic mass of an atom is the sum of the number of protons and neutrons present in the nucleus, expressed in atomic mass units. The mass of one proton and one neutron is roughly equal, and one atomic mass unit is defined as the mass of 1/12 th of a carbon atom (isotope : C.. and neutrons in the nucleus.
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- One atomic mass unit is equal to 1.660538921 × 10 -27 kg, or 1/12th of the mass of a standard carbon-12 isotope. When expressed this way, atomic mass is called relative isotopic mass, which has the same numerical value as atomic mass. However, relative isotopic mass is technically unit-less.