There are 83 protons in the nucleus of bismuth-209 (Bi-209), and for the longest time, it was thought to be the heaviest element with at least one stable isotope. But it turns out that is it actually an alpha emitter with a half-life of about 19 x 10-18 years. As that is an extraordinarily long time, no wonder it wasn't discovered. But given such a long half-life, a lot of folks still consider it to be stable. But since it has been revealed that bismuth is unstable (though on a timescale longer than geologic), that leaves lead, with its 82 protons, as the heaviest element with a stable isotope.
Mass number is a value approximate to the number of protons (Atomic Number) plus the number of neutrons within an atom of the element considered. I say approximate as mass number takes into account the mass of the nucleus and not the actual number of protons and neutrons in the nucleus.
The number of protons in the nucleus of an atom is equal to the atomic number of the element.
An atom's atomic number gives its number of protons in its nucleus. Checking the periodic table, we see that gold's atomic number is 79. Thus, gold is the element with 79 protons.
Protons are positively charged subatomic particles found in the nucleus of an atom. They have a mass approximately 1,800 times that of an electron. The number of protons in the nucleus determines the element, as each element has a unique number of protons.
The number of protons in the nucleus of the atom. This is because in a neutral atom, the number of electrons is equal to the number of protons in the nucleus, which maintains overall electrical neutrality.
The elements with the highest atomic numbers have the greatest numbers of protons in their nucleus, because that is the definition of atomic number.
The number of protons in the nucleus of the atom.
The number of protons in an atom's nucleus is the Atomic number.
The number of protons in an atom's nucleus determines its chemical identity.
The number of protons in a nucleus depends on which element it is. ( The number of protons is the decider as to which element it is. ) The number of electrons in an atom is the same as the number of protons in the nucleus, but none of the electrons are in the nucleus. Rather, they orbit around the nucleus like planets round a star.
The number of protons in the atomic nucleus is equal to atomic number.
The atomic number reflects the charge number of the nucleus. It is always equal to the number of protons found in the nucleus.
There are 47 protons in Silver's atomic nucleus. The number of protons is the same as the atomic mumber.
The number of protons in the nucleus is the same as the atomic number.
The number of protons in the nucleus of an atom.
The number of protons in an elements nucleus is the same number at the atomic number.
A nucleus contain protons and neutrons. A nucleus can hold more protons - the number is equal to atomic number.