Mass number is found by adding the number of protons plus the number of neutrons. Electrons are not added because they are so minute that their masses have almost no bearing on the total mass of the atom.
In this case, the mass number would be about 214.
This element has an atomic number of 82 and a mass number of 207. It's lead (Pb), and it's Pb-207, one of the three stable isotopes of lead. A link is provided below.
Lead-208
Lead
Lead-208, which is 52.3% of natural lead.
the element is lead and the particular isotope is Pb-206
The element with 86 electrons, 125 neutrons, and 82 protons is the element Lead (Pb). The number of protons (atomic number) determines the element, and in this case, it is 82 for lead. The sum of protons and neutrons gives the atomic mass, which is 207 in this case, making it the isotope with mass number 207.
Protons = 82 Neutrons = 214 - 82 = 132 So ratio of protons to neutrons = 82 : 132 or 1 : 1.61
Lead has: 82 Protons 82 Neutrons 125 Electrons
leadLead but it has 82 protons and electrons and 125 neutronshope i helpedLead 125, with a -4 chargeradon
Lead-208, which is 52.3% of natural lead.
the element is lead and the particular isotope is Pb-206
The element with 86 electrons, 125 neutrons, and 82 protons is the element Lead (Pb). The number of protons (atomic number) determines the element, and in this case, it is 82 for lead. The sum of protons and neutrons gives the atomic mass, which is 207 in this case, making it the isotope with mass number 207.
Lead, (Pb) has an Atomic number of 82 (you can look this up on a periodic table).This means it has 82 Protons and a neutral atom also has 82 electrons.To find the number of Neutrons you subtract the Atomic Number (82) from the Atomic Mass (208).Therefore the number of Neutrons in this isotope of Lead is 208-82 = 126
Pb (lead) 82 protons 82electrons 125 neutrons
Protons = 82 Neutrons = 214 - 82 = 132 So ratio of protons to neutrons = 82 : 132 or 1 : 1.61
They are both Isotopes of Barium. The 56 protons tell us that the element is Barium and when you add the neutrons with the protons you get barium138 and barium134. They are both stable isotobes of barium but of all the barium in the world about 72% is barium138 and 2% is barium134.
Lead has: 82 Protons 82 Neutrons 125 Electrons
Lead, atom number 82, has 4 natural occurring isotopes Pb-204, 206, 207 and 208.They all have 82 protons and 82 electrons.The neutron number varies from 122, 124, 125 and 126 respectively.(Remember: atom number = p+ = e- and mass number = p+ + n0 )Pb-207 has 82 protons, 82 electrons and 125 neutrons
The largest known completely stable (e.g., stable to alpha, beta, and gamma decay) nucleus is lead-208 which contains a total of 208 nucleons (126 neutrons and 82 protons).
82 protons