how to find number of neutrons?
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Take note that the nucleus of an atom is composed of protons and neutrons. And the number of particles present in the nucleus is referred as mass number (Also, called as atomic mass). So, to determine the number of neutrons in atom, we only have to subtract the number of protons from the mass number.
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Along with protons, they make up almost all of the mass of the atom. The number of neutrons is called the neutron number and can be found by subtracting the proton number from the atomic mass number.
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How many protons, neutrons, and electrons are there in an atom of uranium-238? Write the symbol for this isotope. The atomic number of uranium (see periodic table) is 92, and the mass number of the isotope is given as 238. Therefore, it has 92 protons, 92 electrons, and 238 — 92 : 146 neutrons.
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Locate the atomic number for the number of protons and electrons in the atom on the periodic table. The number of protons and electrons is equal to the atomic number. Calculate the number of neutrons by subtracting the atomic number from the isotope number.
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1 Answer. 19 protons, 20 neutrons and 18 electrons.
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Nitrogen 15 has an atomic mass of 15. The mass number is # protons plus # of neutrons, so for N-15 mass is 15 and the protons are always 7 so there have to be 15-7=8 neutrons. N-15 has 7 electrons because it has 7 protons and p = e.
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This tells you that potassium has 19 protons and - since the number of protons is the same as the number of electrons- also 19 electrons. To find out the number of neutrons you have to look at the atomic mass or weight of the element. This can also be found in the periodic table.
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So in this case the atom has 20 neutrons. A potassium ion, K+ has an atomic number of 19 and a mass number of 39 So there are 19 protons and 39-19 = 20 neutrons.
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However an element's mass numbers can vary, which means that it can have different numbers of neutrons . So although chlorine has a mass number of 35 which means it has 18 neutrons, it can also have a mass number of 37, which means it has 20 neutrons. The different types of chlorine are called isotopes .
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['Use the chemical formula to determine the number of each type of atom present in the compound.', 'Multiply the atomic weight (from the periodic table) of each element by the number of atoms of that element present in the compound.']
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Answer and Explanation: The mass number of an atom with five protons and seven neutrons is 12.
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Problem: The total numbers of neutrons, protons, and electrons in 27Al3+ are: A. 14 neutrons, 13 protons, 13 electrons B. 35 neutrons, 17 protons, 18 electrons C.
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Answer and Explanation: The atomic number of an atom that has 6 protons, 6 neutrons, and 6 electrons would be 6.
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If an element has 43 protons and 50 neutrons, its atomic number is 43. The element whose atomic number is 43 is technetium, or Tc.
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['Step 1: Obtain the mass of each element present in grams. ... ', 'Step 2: Determine the number of moles of each type of atom present. ... ', 'Step 3: Divide the number of moles of each element by the smallest number of moles.']
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For helium, it is 4: two protons and two neutrons. For most of the 16 lightest elements (up to oxygen) the number of neutrons is equal to the number of protons.
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Along with protons, they make up almost all of the mass of the atom. The number of neutrons is called the neutron number and can be found by subtracting the proton number from the atomic mass number. The neutrons in an element determine the isotope of an atom, and often its stability.