Why the nucleus is very dense?
Electrons have virtually no mass, but protons and neutrons have a lot of mass for their size. As a result, the nucleus has virtually all the mass of an atom. Given its great mass and tiny size, the nucleus is very dense.
How do you find an isotope?
Isotopes are simply specifying the number of neutrons and protons (together called nucleons) in the atom. So, Carbon-12, which has an atomic mass number of 12, has 6 neutrons (12 nucleons – 6 protons = 6 neutrons). Carbon-13, which has an atomic mass number of 13, has 7 neutrons (13 nucleons – 6 protons = 7 neutrons).
How do you find the symbol of an isotope?
To write the symbol for an isotope, place the atomic number as a subscript and the mass number (protons plus neutrons) as a superscript to the left of the atomic symbol. The symbols for the two naturally occurring isotopes of chlorine are written as follows: 3517Cl and 3717Cl.
Do all elements have isotopes?
All elements have isotopes. There are two main types of isotopes: stable and unstable (radioactive). There are 254 known stable isotopes. All artificial (lab-made) isotopes are unstable and therefore radioactive; scientists call them radioisotopes.
Which elements do not have any isotopes?
Elements that have no isotopes
- Beryllium-9.
- Fluorine-19.
- Sodium-23.
- Aluminum-27.
- Phosphorus-31.
- Scandium-45.
- Manganese-55.
- Cobalt-59.
Do any atoms not have isotopes?
A monoisotopic element is an element which has only a single stable isotope (nuclide). There are only 26 elements that have this property. Monoisotopic elements are characterized, except in a single case, by odd numbers of protons (odd Z), and even numbers of neutrons.
Which element has highest isotopes?
cesium
Which is the least stable nucleus?
The least stable nucleus is Fe.
- Nuclear stability means that the nucleus of an element is constant and it does not spontaneously produce radiations.
- The nuclei with the maximum binding energy are the most stable e.g Carbon.
- A stable atom has enough binding energy to hold the nucleus together permanently.
What is the stability of nucleus?
Definition. Nuclear stability means that the nucleus of an element is stable and thus it does not decay spontaneously emitting any kind of radioactivity. Those nuclei with the highest binding energy per nucleon are the most stable with respect to destructive nuclear reactions.
Which isotope is the least stable?
Isotopes per element. Of the known chemical elements, 80 elements have at least one stable nuclide. These comprise the first 82 elements from hydrogen to lead, with the two exceptions, technetium (element 43) and promethium (element 61), that do not have any stable nuclides.
Is oxygen a stable element?
Due to its electronegativity, oxygen forms stable chemical bonds with almost all elements to give the corresponding oxides.
Why is carbon 13 stable?
Both 12C and 13C are called stable isotopes since they do not decay into other forms or elements over time. The rare carbon-14 (14C) isotope contains eight neutrons in its nucleus. Unlike 12C and 13C, this isotope is unstable, or radioactive. Over time, a 14C atom will decay into a stable product.
Why is carbon 13 important?
The importance of C13 is all the greater because two of the three radioactive isotopes of carbon decay too rapidly to be suitable tracers, while the remaining one (C14) has so long a life (3,000 years) that its detection by radioactive methods is relatively insensitive.
How is carbon 13 formed?
C and 13C are stable, occurring in a natural proportion of approximately 93:1. C is produced by thermal neutrons from cosmic radiation in the upper atmosphere, and is transported down to earth to be absorbed by living biological material.