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Definition of elements that are stable?
This is an element (more exactly an isotope) which is not radioactive.
Is Americium pure or not pure?
Americium can be obtained as a pure element (more exactly isotope).
Do any copper isotopes have a mass of 63.546 amu?
No, no copper isotope has a mass of exactly 63.546 amu. The closest copper isotope in terms of mass is copper-64 (63.929 amu).
What are the units for average relative atomic masses?
The unit is such that the isotope Carbon 12 is exactly 12 by definition.
An isotope of radon has 86 protons and 137 neutrons what is the mass number of this isotopes?
An isotope of indium has 77 protons and 115 neutrons. What is the mass number of this isotope
What isotope of carbon has been chosen as the reference isotope for atomic mass units?
The atomic mass may be considered to be the total mass of protons, neutrons and electrons in a single atom (when the atom is motionless). Relative isotopic mass is the relative mass of a given isotope scaled with carbon-12 as exactly 12.
What is the mass of a mole of isotope carbon-12?
According to the definition by IUPAC, the mass of a mold of carbon-12 isotope is exactly 12.0000 g.
Is the quantity of a radioactive isotope ever equal to exactly zero?
Yes. There are isotopes of elements that are simply not found anywhere in the universe (and even if they did exist momentarily, their lifetime is so short that in the next moment they would have decayed into a different more stable isotope).
Is it possible to determine exactly when a particular unstable isotope will begin to decay?
No. The time it will take for an individual unstable atom to decay is completely random and impossible to predict. However, because there are so many atoms in a sample (6.02x1023 in one mole) it is possible to observe the half-life of the atoms. The half-life is the time that it will take for half of the atoms in a sample of a radioactive isotope to decay into another element or isotope. This is a constant property of the isotope and does not depend on the sample size.
What is the stable isotope that is formed by the breakdown of a radioactive isotope?
The stable isotope formed by the breakdown of a radioactive isotope is called a daughter isotope. This process is known as radioactive decay, where a radioactive isotope transforms into a stable daughter isotope through the emission of particles or energy.
What form of matter is made from only one type of a atom?
You think probable to a chemical element or more exactly to an isotope. Elements may be solid, liquid or gaseous.
244 94Pu is an of plutonium?
isotope
