This reason is, simply, very obvious. Compare the numbers: 238 and 16. Since the orbitals are more full, and the nucleus is packed tighter, and Uranium is located after atomic number 84, it is unstable. All of the elements after 84 are unstable. But that doesn't count isotopes of the earlier elements, because they can be unstable.
Due to a large number of Nucleons (protons+neutron) the nuclear binding force is not enough strong to hold the nucleons unite.
It's a problem of the nucleus structure (number of neutrons and protons).
It's heavier.
Atomic weight (not mass) of uranium is 238,02891.
the atomic mass number for uranium is 92
The non-synthetic element that has the largest atomic mass is uranium, although it is radioactive. The atomic mass of uranium is 238.0289.
Uranium atomic number: 92 Uranium atomic weight: 238,02891 Uranium number of protons: 92
Atomic mass number = Number of protons + Number of neutrons Number of protons of uranium nucleus is 92. The number of neutrons is different for each isotope. Example for 238U: 92 protons + 146 neutrons = 238
In their most stable forms, Uranium has an atomic mass of 238 and plutonium has an atomic mass of 244, plutonium has a greater mass than that of Uranium.
Atomic oxygen does not have a greater atomic mass than chlorine, nor does molecular oxygen. The atomic mass of chlorine is approximately 35 g/mol, while molecular (O2) oxygen has a molecular mass of 32 g/mol.
The atomic weight of uranium (not mass) is 238,02891.
The atomic mass is greater.
Atomic weight (not mass) of uranium is 238,02891.
the atomic mass number for uranium is 92
The atomic weight of uranium is 238,02891(3) atomic mass units.
The non-synthetic element that has the largest atomic mass is uranium, although it is radioactive. The atomic mass of uranium is 238.0289.
The atomic weight (not mass) of uranium is 238,02891(3).
The atomic weight of uranium is 238,02891(3); the word weight is correct here not mass.
Uranium atomic number: 92 Uranium atomic weight: 238,02891 Uranium number of protons: 92
Atomic mass number = Number of protons + Number of neutrons Number of protons of uranium nucleus is 92. The number of neutrons is different for each isotope. Example for 238U: 92 protons + 146 neutrons = 238