Atomic Mass

so the mass of an atom is determined by the number of protons and neutrons in an element. For a given element, the number of protons is the same but the number of neutrons can vary (an element can have various isotopes). Therefore, the average atomic mass of an element is simply a weighted average of the masses of all the isotopes of that element.

(a weighted average means that how common an isotope is is taken into account when incorporating it into the average, so rare isotopes will not count as much as common isotopes)

Please see the Periodic Table of Elements.

Mass is a fundamental concept in physics, roughly corresponding to the intuitive idea of how much matter there is in an object. Mass is a central concept of classical mechanics and related subjects, and there are several definitions of mass within the framework of relativistic kinematics (see mass in special relativity and mass in General Relativity). In the theory of relativity, the quantity invariant mass, which in concept is close to the classical idea of mass, does not vary between single observers in different reference frames.

In everyday usage, mass is more commonly referred to as weight, but in physics and engineering, weight means the strength of the gravitational pull on the object; that is, how heavy it is, measured in units of force. In everyday situations, the weight of an object is proportional to its mass, which usually makes it unproblematic to use the same word for both concepts. However, the distinction between mass and weight becomes important for measurements with a precision better than a few percent (due to slight differences in the strength of the Earth's gravitational field at different places), and for places far from the surface of the Earth, such as in space or on other planets.

Antoine Lavoisier - developed the Law of Conservation of Mass.

Sorry no where does it inidcate who discovered the term "mass".

Hope my info helps

The atomic mass of an atom with 11 protons and 12 neutrons is calculated by adding the number of protons and neutrons together. In this case, the atomic mass would be 11 (protons) + 12 (neutrons) = 23 atomic mass units.

Scientists use the symbol "u" to represent atomic mass unit.

Cadmium is a metal element. Atomic mass of it is 112.

In 1803 Dalton suggested 1H as the basic unit for the atomic mass unit(amu). Ostwald recommended 1/16 mass of Oxygen. However, this suggestion was made before the isotopes 17O an 18O were discovered. Since 1961, the unit is based on 1/12 mass of 12C.

The scientific unit of mass is the kilogram, symbolized as "kg." It is defined as the mass of the international prototype of the kilogram, a platinum-iridium cylinder kept at the International Bureau of Weights and Measures in France.

The relative atomic mass of chlorine is 35.5. The two main isotopes are chlorine-35 and chlorine-37.

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)+[...]

the answer to your question is 4grams thank you

The atomic mass of scandium (Sc) is 44.955908 u (unified atomic mass units).

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.

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.

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!

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%

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.

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.

The atomic mass of Xe is 131.293

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.

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.