Barium (Ba)
Barium has an atomic number of 56 and a mass number of 137 amu
The element with an atomic number of 56 is barium (Ba). However, the mass number of 137 amu does not match any known isotopes of barium. This suggests that the atom in question may be an isotope of barium that is not naturally occurring or may have been produced in a laboratory setting.
The standard atomic weight for cesium is 133. There are 3 other radioactive cesium isotopes that have atomic weights of 134, 135, and 137. Cesium 133 is the only one that is found in nature. The other isotopes are synthetic.
To find the number of moles, divide the sample's mass (348.2 g) by the molar mass of the compound (137 g/mol). Since the compound's formula is C3H8NO5P, the molar mass is the sum of the atomic weights of each element: [3(12.01) + 8(1.01) + 14.01 + 5(16.00) + 30.97] = 137 g/mol. Thus, there are 2.54 moles of molecules in the 348.2-g sample of Roundup.
Sn (tin) has an atomic number of 50, which indicates there are 50 protons in its nucleus. If the atomic mass is 118, then the number of neutrons is the difference between the two numbers, or 68 neutrons.
Barium is a non metal element. Atomic mass of it is 137.
Barium has an atomic number of 56 and a mass number of 137 amu
Ceasium is a metal element. Atomic mass of it is 133.
The element with an atomic number of 56 is barium (Ba). However, the mass number of 137 amu does not match any known isotopes of barium. This suggests that the atom in question may be an isotope of barium that is not naturally occurring or may have been produced in a laboratory setting.
The mass number is the sum of protons and electrons in the atomic nucleus of an isotope. Barium has many isotopes and each has another mass number.
The atomic number of barium is 56. It has naturally occurring isotopes with mass numbers of 130, 132, 134, 135, 136, 137, and 138.
The atomic weight (not mass) of barium is 137,327(7).
In atomic form (as opposed to being an ion), cesium-137 has 55 electrons, just as all cesium atoms have.
An isotope of indium has 77 protons and 115 neutrons. What is the mass number of this isotope
The atomic number of barium is 56. So there are 56 protons and 56 electrons.
The standard atomic weight for cesium is 133. There are 3 other radioactive cesium isotopes that have atomic weights of 134, 135, and 137. Cesium 133 is the only one that is found in nature. The other isotopes are synthetic.
Same mass, atomic number one lower - Cs - caesium