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Atomic Mass
Atomic mass is the mass of protons, neutrons, and electrons in a single specific atom.
1,752 Questions
Why atomic mass of an atom is defined as relative atomic mass?
It is calculated as the ratio of the mass of one atom of an element to one twelfth of the mass of an atom of carbon-12. In fact, the weighted average of the mass of an atom of an element - weighted according to its isotopic abundance.
What is the atomic number and atomic mass number in nitrogen -15?
The atomic number is 7.
The mass number is 15.
The atomic mass is 15,000 108 898 2(7).
protons - 12
electrons - 12
neutrons - 12
atomic mass - 24.3050
solid at room temperature
Due to Helium Burning. Helium, being the second most abundant element, reacts with other nuclei to form hevier elements.
He(RAM: 4) + He(RAM: 4) = Be(RAM: 8)
Be(RAM: 8) + He(RAM: 4) = C(RAM: !2) (+ gamma-ray)
C(RAM: !2) + He(RAM: 4) = O(RAM: 16) (+ gamma-ray)
ect..
What is the atomic mass of hafnium?
The atomic mass of hafnium is approximately 178.49 atomic mass units.
There is no Na3. The atomic weight for sodium (Na) on the periodic table is 22.989770.
What is isoechoic mass in uterus?
An isoechoic mass in the uterus is a mass that has the same density as the uterine tissue. This is most often a fibroid. Talk with your health care provider for advice specific to your situation.
How scovery of isotopes explain why atomic wieghts do not always give the correct order of elements?
This is due to the fact that all elements have isotopes, meaning that there atomic weight is in fact much greater than stated in the periodic table. This means that the elements are only weighed by their compound and not including the isotopes.
What does atomic mass represent of an element represent?
Atomic Mass represents the mass of atom. We use mass of protons and neutrons.
To calculate the atomic mass of chlorine using its naturally occurring isotopes, you can use the formula:
Atomic mass = (abundance of isotope 1 × atomic mass of isotope 1) + (abundance of isotope 2 × atomic mass of isotope 2).
In this case, you would multiply the atomic mass of each isotope by its respective abundance (expressed as a decimal) and sum the results to find the weighted average atomic mass of chlorine.
Why can you subtract the atomic number from the atomic mass and get the number of neutrons?
Not the atomic mass but the mass number (of course, these values are similar - not identical).
The mass number is the sum between the number of protons and the number of neutrons. As a consequence:
Number of neutrons for an isotope = Mass number - Number of protons
The number of protons is equal to the atomic number.
Atomic mass differnet from the atomic mass number why is that?
The atomic mass is an average, allowing for the relative abundances of different isotopes.
Why mass of electrons is excluded from atomic mass?
The mass of electrons is not excluded from atomic mass. The mass number of an isotope of an element excludes electrons because it is the sum of protons and neutrons.
From Wikipedia, "The atomic mass (ma) is the mass of a specific isotope, most often expressed in unified atomic mass units. The atomic mass is the total mass of protons, neutrons and electrons in a single atom."
