The mass number of an iron that has 29 neutrons would be 55. You just take the atomic number of iron, which is 26, and add that to the number of neutrons, which is 29, and you get 55.
Iron
30, Total weight - neutron number. 60 - 35 = 30
The element that has 26 electrons 29 neuetrons and 26 protons is Iron (Fe) The number of protons= electrons/atomic number
Iron-56 has 26 protons, 30 neutrons, and 26electrons.
There are two stable isotopes of Copper, 63Cu29, with 34 neutrons, and 65Cu29, with 36 neutrons. There are also 27 other unstable isotopes of Copper, ranging from 23 neutrons to 51 neutrons. See the related link below, on line 29, for more information.
The atomic number of iron is 26 whereas the mass number of it is 56. Therefore it has 26 electrons and 30 neutrons (56-26).
Number of neutrons = Mass number - atomic number = 29 - 14 = 15
Number of neutrons = Mass number - Atomic number = 63 - 29 = 34 neutrons
29 SI (Neutrons 15)
Copper has 29 electrons and protons; the number of neutrons is specific for each isotope. Number of neutrons in a copper isotope = Mass number - 29
The atomic number of Copper (Cu) is 29. See the Web Links for more information about copper to the left of this answer.
Silicon-29 has 14 protons (atomic number), 14 electrons if the atom is neutral, and 15 neutrons (mass number - atomic number).
Iron
26 protons, 26 electrons and 29 neutrons in 26Fe55 isotope
30, Total weight - neutron number. 60 - 35 = 30
Iron-56 has 26 protons, 30 neutrons, and 26electrons.
The element that has 26 electrons 29 neuetrons and 26 protons is Iron (Fe) The number of protons= electrons/atomic number