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Atomic Mass
Atomic mass is the mass of protons, neutrons, and electrons in a single specific atom.
1,752 Questions
There are several isotopes of Boron, which have different levels of abundance. I don't know the accurate numbers, but say like 25% of Zu-isotopes are 1 amu, and 75% of Zu-isotopes is 2, it would be 1.75 amu for the Atomic mass. Relating Zu to B of course, what I mean is Boron's different isotopes appear in different abundances and have different masses. 14% of boron may be about 6.882 amu, but just think about it like the above analogy of Zu, where Zu either weighs 1 or 2, but never 1.75.
By the way, to find amu for an element:
(%1*Iso1)+(%2*Iso2)+[...]
What is the atomic mass of scandium?
The atomic mass of scandium (Sc) is 44.955908 u (unified atomic mass units).
What is the atomic mass of vanadium?
The atomic mass of vanadium is approximately 50.94 atomic mass units (amu).
The atomic number (Z) is the number of protons in the nucleus, which also equals the number of electrons in a neutral atom. Therefore, an atom with an atomic number of 17 will have 17 electrons if it is electrically neutral.
What is the atomic mass of a electron?
That's going to be somewhere in the neighborhood of 0.00054 .
About 1,840 electrons have the same mass as one neutron or proton.
So, in the largest naturally occuring atom ... Uranium ... with 92 electrons,
the electrons don't even contribute 1 count to the mass of the whole atom.
Atomic mass is the number of protons present in the nucleus or number of electrons revolving around the nucleus in an atom .It is denoted by Z.
Mass number is the sum of number of protons and neutrons present in a nucleus in an atom .It is denoted by A.
What does atomic mass number tell us?
The atomic mass number tells us the total number of protons and neutrons in an atom's nucleus. It is used to determine the mass of an atom and is necessary for calculating the atomic weight of an element.
The atomic number of tellurium (Te) is 52.
The atomic weight of Te 127.60 grams per mole.
See the Web Links to the left of this answer for a periodic table with more information about this element!
What is the definition of atomic mass number?
Atomic Mass is the sum of the number of protons and neutrons in the atom, plus any additional mass conferred by electrons. (Since electrons are roughly 1/1837th of a proton's mass, this additional mass is minuscule and is only represented in atoms that have atomic numbers at the higher end of the table.) It should be an integer/whole number.
The reason that most elements have a number with decimals for their atomic mass numbers on the Periodic Table is because those numbers average all of the different isotopes of the element in proportion to how common they are. For example, Oxygen has an atomic mass number of 15.999 since the overwhelming majority of oxygens have 8 protons and 8 neutrons for a total atomic mass number of 16, but there are some rare oxygens with 8 protons and 7 neutrons for a total atomic mass number of 15. Once these are averaged, since the 16s are much more common, the resulting number is 15.999.
The atomic mass of Lithium is equal to the weighted average of the two naturally occurring isotopes.
Let M=the atomc mass of Lithium; M1=the mass of lithium-6;M2=the mass of Lithium-7; %a=the abundance of lithium-6; %b=the abundance of lithium-7.
M=(M1*%a+M2*%b)/100
we know that %a and %b must add up to give us 100%, so %a=100-%b.
Therefore M=(M1*(100-%b)+M2*%b)/100
Then we just need to solve for %b because everything else is known.
M=(M1*100-M1*%b+M2*%b)/100-->M-M1=(-M1*%b+M2*%b)/100
100(M-M1)=(-M1*%b+M2*%b)-->%b=100(M-M1)/(M2-M1)=92.5%
Then %a=100-%b=100-92.5=7.5%
What is the average atomic mass of element 115?
Element 115, ununpentium, is a synthetic element, and only the tiniest amount has been made. But Larger quantities have been found in nature, in the form of a meteor. Of the samples taken, 287Uup and 288Uup have been identified. But we don't know with any accuracy what percentage of the sample is one or the other. That makes it hard to find an "average" atomic mass.
What's more, as we experiment, we may find other ways of harnessing element 115 to use for more military purposes, such as weaponry. The United States of America, and Germany are currently the two leading countries trying to develop the element 115, along with Russia and Japan. No one knows what effect the radioactivity has on humans and slight testing has apparently begun in Germany. The leading scientist developing Element 115 is Doctor Richtofen, who's current position is unkown? Doctor Richtofen was working on a way to incorporate element 115 into different use of weapons and another side project unannounced to us at this time at a German scientific facility called Der Reise. Only time will tell what great advances in science will this new and strange element bring us.
What does the atomic mass of an atom represent?
the mass of an atom of a chemical element expressed in atomic mass units. It is approximately equivalent to the number of protons and neutrons in the atom (the mass number) or to the average number allowing for the relative abundances of different isotopes.
Two or more forms of the same chemical element that differ in atomic mass?
Isotopes are two or more forms of the same chemical element that differ in atomic mass due to having a different number of neutrons in their nuclei. These isotopes of an element have the same number of protons and electrons but vary in their overall mass.
Why does helium have an atomic number of 2 and atomic mass of 4?
An atom's atomic weight is the total of all protons and neutrons in its nucleus. Helium almost always contains two protons and two neutrons. Therefore, its atomic weight is 2 + 2 = 4.
The atomic mass is equal to the number of protons plus neutrons. So if you know the atomic number then you can find out the number of neutrons
Atomic # is the amount of Protons or Electrons
Atomic Mass- Number of protons plus neutrons
Atomic Mass-Atomic Number = Amount of neutrons
What determines the atomic mass of an element?
The atomic weight of an atom depends on the number of protons and neutrons in one atom of the element, and is usually the average mass of all the known natural isotopes of the element. The atomic weight refers to the force of gravity on one atom of the element.
After the IUPAC rules the atomic mass is a term used only for the mass of isotopes; and the atomic weight is the term used for an element.
The atomic weight of an atom is determined by the mass of its constituent particles, the protons, electrons, and neutrons. In practice, however, the electrons are so much smaller than the protons and neutrons, and the neutrons are close enough to the mass of the protons, that it is common to say that the atomic weight is the number of protons plus the number of neutrons. This is not exact, however, and the periodic table reflects this.
No, the number and location of atomic mass units do not determine the kinds of chemical reactions an atom may undergo. It is the number and arrangement of electrons in an atom's outer shell that determine its chemical reactivity. The outer shell electron configuration is what influences how atoms interact with other atoms to form chemical bonds.
What is the atomic mass for silicon?
The atomic weight of Silicon is 28.086 amu (atomic mass unit)
NOTE* An atomic mass unit is approximately 1.66053886 x 10-27 kg.
What is the atomic number and atomic mass of Sodium?
The atomic number of Sodium is 11, which means it has 11 protons in its nucleus. The atomic mass of Sodium is approximately 23 amu (atomic mass units), which is the weighted average of all the isotopes of Sodium found in nature.
Are the atomic mass and atomic number directly proportional to each other?
No, atomic mass and atomic number are not directly proportional to each other. Atomic mass represents the average mass of isotopes of an element, while atomic number represents the number of protons in an atom's nucleus. These values are related but not directly proportional.
What is atomic mass an average of?
"Atomic Mass" is not an average, it is tje total mass of all the electrons, protons and neutrons in an atom of an element. AVERAGE Atomic Mass is the AVERAGE of the Atomic Masses of all of the Isotopes of an element according to their natural proportions.
