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e.g.
Gold has 79 protons and 118 neutrons = 197 nucleons.
But some gold atoms are strange they only have 117 neutrons.
They are isotopes.
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What is the valency of an atom of a mass number 25?
The only non-radioactive isotope with a mass number of 25 is magnesium-25. The valency of magnesium is 2.
What is the difference between a bonding electron domain and a non bonding electron domain?
bonding electrons are when the electron have the same number and the connect,like valence electrons. Non-bonding electrons are only possible when an atom is unstable, no more than 2 electrons or if the atom is an isotope. bonding electron pairs occur in a covalent bond between two atoms. they include one electron from each atom in the covalent bond. non-bonding pairs do not take part in bonding. they are the left over electrons in the outter shell of the atom.
What is the atomic mass of an oxygen atom?
The atomic mass of an oxygen atom depends on which isotope of oxygen you are referring to. The AVERAGE atomic mass is approximately 15.9994
Does The largest stable nucleus have 26 protons?
No. In fact the largest stable nucleus of any atom in it's non isotope form is Lead at 82 protons
What does the atomic mass of an element repreasent?
The atomic mass number of an isotope represents the sum of the numbers of neutrons and of protons in a nucleus of the isotope. For elements with more than one stable (non-radioactive) isotope naturally occurring, the atomic mass of the element as shown in a reference is the weighted average of the atomic masses of all the naturally occurring isotopes, weighted by the fraction that each isotope constitutes of the total natural supply of the element.
How is an isotope different from an atom?
Isotopes aren't mutually exclusive of an atom - that is, you don't have to be one or the other (in fact, it is both). An isotope of an atom is an atom that has an unusual atomic weight, usually caused by having a non-regular amount of neutrons (they don't change the charge, so you can shove as many in an atom as you want, within limits).
What element has 28 subatomic particles in the nucleus of one atom?
The only non-radioactive isotope with the specified properties is silicon-28, which constitutes more than 90 % of naturally occuring silicon.
How long does an atom live?
It depends on which isotope of which element you are talking about. Carbon's isotope C-12 lasts forever because it is a stable, non-radioactive element. Carbon's other isotope, C-15, however, lasts only 2.5 seconds after it appears into existence. Therefore, because different isotopes of different atoms last different amounts of times, it is impossible to say how long an atom lives because there are so many different elements. However, if you take a look at the link provided, you can pick an element from any of those, scroll down the page a little bit, and there should be a data table. It tells how long that element's isotope lives.
Would an atom with 60 protons and a mass number of 155 be stable?
The isotope 155Nd is non stable (radioactive); his half life is 8,9 seconds.
What is the valency of an atom of a mass number 25?
The only non-radioactive isotope with a mass number of 25 is magnesium-25. The valency of magnesium is 2.
What is the difference between a bonding electron domain and a non bonding electron domain?
bonding electrons are when the electron have the same number and the connect,like valence electrons. Non-bonding electrons are only possible when an atom is unstable, no more than 2 electrons or if the atom is an isotope. bonding electron pairs occur in a covalent bond between two atoms. they include one electron from each atom in the covalent bond. non-bonding pairs do not take part in bonding. they are the left over electrons in the outter shell of the atom.
What is the atomic mass of an oxygen atom?
The atomic mass of an oxygen atom depends on which isotope of oxygen you are referring to. The AVERAGE atomic mass is approximately 15.9994
Does The largest stable nucleus have 26 protons?
No. In fact the largest stable nucleus of any atom in it's non isotope form is Lead at 82 protons
Name 3 radioactive metals?
Most elements - metals and non-metals - have both stable and radioactivie isotopes. If an element is a type of atom, an isotope is something like a "sub-type". Two isotopes of the same element have the same number of protons, but a different number of neutrons.Most elements - metals and non-metals - have both stable and radioactivie isotopes. If an element is a type of atom, an isotope is something like a "sub-type". Two isotopes of the same element have the same number of protons, but a different number of neutrons.Most elements - metals and non-metals - have both stable and radioactivie isotopes. If an element is a type of atom, an isotope is something like a "sub-type". Two isotopes of the same element have the same number of protons, but a different number of neutrons.Most elements - metals and non-metals - have both stable and radioactivie isotopes. If an element is a type of atom, an isotope is something like a "sub-type". Two isotopes of the same element have the same number of protons, but a different number of neutrons.
What is a non renewable of Uranium U 235?
The fissile isotope uranium 235 is "burned" in the nuclear reactors to obtain electrical/thermal energy. The atom is destroyed by nuclear fission.
What does the atomic mass of an element repreasent?
The atomic mass number of an isotope represents the sum of the numbers of neutrons and of protons in a nucleus of the isotope. For elements with more than one stable (non-radioactive) isotope naturally occurring, the atomic mass of the element as shown in a reference is the weighted average of the atomic masses of all the naturally occurring isotopes, weighted by the fraction that each isotope constitutes of the total natural supply of the element.
What are two atoms called when they have different number of protons?
The atomic number is the number of protons, so in this case it is 2, which is Helium. The charge or ionization of the atom is the difference between the number of protons and the number of electrons; in this case, they are the same, so the atom is neutral (not ionized). The atomic mass number is the sum of the protons and neutrons, so in this case 4. Thus, you have a non-ionized atom of Helium-4.
