Lead is a metal element. Atomic Mass number of it is 207.
Mass number refers to a particular isotope of 82Pb.
... that each atom of lead contains 82 protons in its nucleus.
The atomic number for the Element Lead is 82.
The mass number of an atom is the sum of its protons and neutrons. Lead (Pb) has an atomic number of 82, so it has 82 protons. If it has 127 neutrons, the mass number would be 82 (protons) + 127 (neutrons) = 209.
Lead is an element, with the chemical symbol Pb and atomic number 82.
Mass number refers to a particular isotope of 82Pb.
82. Lead is an element with symbol Pb and atomic number 82. The atomic number relates to the amount of electrons of the element
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.
... that each atom of lead contains 82 protons in its nucleus.
The atomic number for the Element Lead is 82.
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Atomic number 82 is Lead (Pb).
The element with 82 protons and an atomic mass of 166 is lead, with the chemical symbol Pb.
The mass number of an element is the sum of its protons and neutrons in the nucleus. Since lead (Pb) has an atomic number of 82, the mass number would be the total of protons and neutrons in a lead atom, which can vary based on the isotope.
Element 82 is lead with the symbol Pb (from the Latin "plumbum.")
Look on the periodic table for the element with the closest atomic mass to that number. It's lead (Pb, #82.) Now, for the neutron count, you round that atomic mass to the nearest whole number, which is 207, then subtract the atomic number of 82 from it. 207-82=125. So 125 neutrons.
Not always -- Hydrogen-3 is radioactive, for example.