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Atomic Mass
Atomic mass is the mass of protons, neutrons, and electrons in a single specific atom.
1,752 Questions
Atomic mass is 201 what is the atomic number?
The atomic number is the number of protons in an atom's nucleus. Given an atomic mass of 201, this information alone does not provide the atomic number as different elements can have the same atomic mass due to isotopes. More specific information about the element is needed to determine the atomic number.
The atomic mass number is equivalent to the number of?
protons and neutrons
It may seem contradictory that the nucleus of an atom sticks together when we know that like charges repel. Why don't the protons repel each other? It does not seem to fit the predicted pattern.
One theory suggests a model that arranges the protons and neutrons in a series of shells or energy levels like the electrons around the nucleus. The nucleus is held together by mesons, positrons, and neutrinos. Gamma rays are emitted when a proton or neutron drops to a lower energy level. Some nuclei are unstable. They have such a delicate balance of forces holding them together that the slightest disturbance will cause them to fly apart. This results in radioactive decay.
Stable nuclei are determined by the ratio of neutrons to protons. The greater the atomic number, the greater the number of neutrons necessary to keep the nucleus stable. The neutrons tend to act as a buffer among the protons, keeping them from repelling each other with such great force. Figure 9 shows the ratio n:p necessary to ensure a stable isotope.
Notice that as the atomic number increases, the number of neutrons must get larger to offset the increase in nuclear charge. Ratios that deviate very much from the curved line are unstable ratios and indicate radioactive isotopes of that particular element. No completely stable nuclei are in elements 83 and above. All isotopes of elements beyond bismuth (83) are unstable and radioactive.
How can the atomic mass of the element be lower than the element that came before it?
Because the periodic table is organized by atomic number, not by atomic mass. The general trend in the periodic table is a higher atomic mass as you go up atomic number, but there are exceptions.
What does atomic mass tell us?
The atomic weight (not mass) of a chemical element is the ratio between the average mass of the atoms of this element to 1/12 from the atomic mass of carbon-12.
The atomic mass is a term applied only to specific isotopes; the unit is the same as above.
The mass number tells us the number (the sum) of protons and neutrons in the nucleus of an atom.
The atomic number, on the other hand, tells us how many protons are in the nucleus of an atom.
IUPAC publish periodically tables of atomic weights - the last edition is from 2009-2010.
For the atomic masses of isotopes the last published edition is The AME 2003 atomic mass evaluation, edited by Audi, Wapstra and Thibault.
What is zirconium atomic mass?
Zirconium, a transition element with an atomic number of 40, has several isotopes, and each has a different mass number. Zr-88 (mass number 88), Zr-89 (mass number 89), Zr-90 (mass number 90), Zr-91 (mass number 91), Zr-92 (mass number 92), Zr-93 (mass number 93), Zr-94 (mass number 94) and Zr-96 (mass number 96).
What is the atomic mass of the element silicon?
Silicone is a non meta element. Atomic mass of it is 28.
What is the atomic number and atomic mass number of barium?
The atomic number of barium is 56. It has naturally occurring isotopes with mass numbers of 130, 132, 134, 135, 136, 137, and 138.
What is the relationship between a atomic number and an atomic mass number?
Atomic number: number of protons in a nucleus unique to an element Atomic mass number: number of protons + number of neutrons in a nucleus. May be a small range of values for a given element. Very roughly the atomic mass number is double the atomic number. For large elements it is more than double.
Calculate the average atomic mass of copper-63 and copper-65?
The average atomic mass of copper is 63.55 g/mol. This value is calculated by taking a weighted average of the masses of copper-63 and copper-65, based on their natural abundances in a sample of copper. Copper-63 has a natural abundance of 69.17%, while copper-65 has an abundance of 30.83%. Calculating the average atomic mass would involve multiplying the atomic mass of each isotope by its natural abundance, and then summing the results.
What is the atomic mass of dysprosium?
The atomic mass of dysprosium is 162.5, though that may just be approximate
The stable isotopes of nitrogen are N14 and N15. The natural abundance of N15 is 0,37%, the remaining N14 being 99,63%.
What is the atomic number the atomic mass and the number of neutrons of the element hydrogen?
The 'standard' hydrogen atom has atomic number 1, atomic mass 1, no neutrons.
Although there are 2 other isotopes of hydrogen:
- (cant confirm name) which has atomic mass 2 and 1 neutron.
- (cant confirm name) has atomic mass of 3 and 1 neutron.
All isotopes have atomic number 1.
The atomic mass of an atom with six electrons eight neutrons and six protons is?
You need to know the atomic number to find the element, and the atomic number equals the # of protons and electrons, which is 6. It is Carbon.
What element has the atomic mass of 9.012?
The element with an atomic mass of 9.012 is Beryllium, which has the atomic number 4.
Do scientists use the symbol g to represent the atomic mass unit?
No. The symbol g represents a gram which is about 6.02x1023 times greater than an atomic mass unit. an atomic mass unit is represented as AMU or g/mol (grams per mole).
What is the average atomic mass of Helium?
The average atomic mass of helium is approximately 4.0026 atomic mass units (amu). This value is a weighted average of the isotopes of helium, primarily consisting of helium-4 with a small contribution from helium-3.
How is the atomic mass unit defined?
a unit of mass used to express atomic and molecular weights, equal to one-twelfth of the mass of an atom of carbon-12. It is equal to approximately 1.66 x 10^-27 kg.
Where on the periodic table are elements which the highest atomic mass?
Elements with the highest atomic mass can be found towards the bottom of the periodic table, typically in the bottom rows known as the actinide and lanthanide series. These elements include heavy elements such as uranium, thorium, and plutonium.
Does the atomic mass tell how many atoms are in an element?
The atomic mass tells how much amu one atom of an element weighs. It, minus the atomic number, rounded to the nearest one, gives you the number of neutrons in an atom. The atomic number is the number of electrons and protons. Protons have a positive charge, electrons have a negative charge, and neutrons are neutral.
The total mass of all the silver atoms would be 10,770,
65(47+60) + 35(47+62) = 10,770 The total number of silver atoms is 100, 65 + 35 = 100 Dividing the total mass by the number of atoms gives us a 10770/100 = 107.7 for an atomic mass by these numbers.
What is the formula of atomic mass?
The formulaic conversion between atomic mass units and SI mass in grams for a single atom is:
where Mu is the Molar mass constant and NA is Avogadro's number.
The number of atoms in a mole is calledAvogadro's number, the value of which is approximately 6.022 × 1023 mol-1One mole of a substance always contains almost exactly therelative atomic mass or molar mass of that substance (which is the concept of molar mass), expressed in grams ..
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