Why are there no stable odd odd nuclei?
In nuclear physics, properties of a nucleus depend on evenness or oddness of its atomic number Z, neutron number N and, consequently, of their sum, the mass number A. Most importantly, oddness of both Z and N tends to lower the nuclear binding energy, making odd nuclei generally less stable.
What are unstable radioactive elements?
Why some elements are radioactive (unstable). When the atoms of an element have extra neutrons or protons it creates extra energy in the nucleus and causes the atom to become unbalanced or unstable. Whether radioactive elements can become stable and if so, how. The unstable nucleus of radioactive atoms emit radiation.
Why do some elements give off radiation?
Radioactive elements emit ionizing radiation as their atoms undergo radioactive decay. Radioactive decay is the emission of energy in the form of ionizing radiation.
What are the three types of radioactive decay?
A material containing unstable nuclei is considered radioactive. Three of the most common types of decay are alpha decay (?-decay), beta decay (?-decay), and gamma decay (?-decay), all of which involve emitting one or more particles.
How do you know if an element is stable or unstable?
An atom is stable if the forces among the particles that makeup the nucleus are balanced. An atom is unstable (radioactive) if these forces are unbalanced; if the nucleus has an excess of internal energy. Instability of an atom’s nucleus may result from an excess of either neutrons or protons.
Why are isotopes unstable?
Explanation: Usually, what makes an isotope unstable is the large nucleus. If a nucleus becomes larger enough from the number of neutrons, since the neutron count is what makes isotopes, it will be unstable and will try to ‘shed’ its neutrons and/or protons in order to achieve stability.
Is sodium stable or unstable?
This is a very unstable arrangement, and the element sodium is a highly reactive, deadly white semi-solid that will burst into flames on exposure to the air or will burn through human flesh on contact. A reactive substance. Chlorine atoms have 17 electrons.
What is the relation between Curie and Becquerel?
One curie (1 Ci) is equal to 3.7 × 1010 radioactive decays per second, which is roughly the amount of decays that occur in 1 gram of radium per second and is 3.7 × 1010 becquerels (Bq). In 1975 the becquerel replaced the curie as the official radiation unit in the International System of Units (SI).
When do off-diagonal elements in Moi occur?
So, off-diagonal elements in your MOI are equivalent to having a rotation axis that is not aligned with any of the principal axes. Again, this only happens when your body is not symmetric about the rotation axis.
What are the off-diagonal moment of inertia matrix elements?
The tensor of moment of inertia contains six off-diagonal matrix elements, which vanish if we choose a reference frame aligned with the principal axes of the rotating rigid body; the angular momentum vector is then parallel to the angular velocity. But while considering the general case, what are the off-diagonal moment of inertia matrix elements?
What is the physical significance of the off-diagonal moment?
It also says: The physical significance of the off-diagonal components is that you’re using a coordinate system not aligned with the principal directions of the object. They tell us nothing interesting about the object itself. Is that all or is there more to it, perhaps related to properties of tensors in general?