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Atomic Mass
Atomic mass is the mass of protons, neutrons, and electrons in a single specific atom.
1,752 Questions
Using a Bainbridge mass spectrograph.
First of all, in these cases, we must thoroughly understand the cute differences between mass of atom, atomic mass, atomic weight, mass number, calculated mass and real mass.
Mass number, simply, is the total number of protons and neutrons (common name nucleon for proton and neutron) present in the nucleus of the atom.
Mass of the atom is the total mass of the nucleus and the mass of all the electrons.
But atomic mass is the total mass of the constituents of the atom namely protons, neutrons in the nucleus.
We calculate the mass of the core by getting the total mass of all the nucleons present in it.
Here we use a convenient unit for measuring mass. That one is known as atomic mass unit (amu) which equals to 1.66 x 10-27kg.
But the beauty is that this calculated mass is not found when we measure the mass of the nucleus by experimental means. The famous instrument to determine the mass of core accurately is a Bainbridge Mass Spectrograph.
The measured mass is slightly less than the calculated mass.
This is termed the mass defect. The equivalent energy to this mass defect is termed the binding energy of the nucleus.
Actually binding energy is that energy which has already come out when the protons and neutrons come together to form the nucleus hence the mass defect is the mass lost as heat energy.
More over there are four isotopes of copper having different number of neutrons in the nucleus. 34,35,36,37. The first and third are normal isotopes (non radioactive) but second and fourth are radio active. The isotopic mass of the isotope you have mentioned is measured as 64.9277 amu.
Why aren't all of the atomic mass numbers in the periodic table whole numbers?
Each atom of an element isn't always exactly the same as another; some can have slightly more mass, and some can have slightly less than others. Atoms with different masses are called isotopes, and in any naturally-occurring sample you get a certain proportion of each isotope. Then the atomic mass is actually the mass of each isotope, multiplied by the proportion of that isotope you'd get in a sample, all added together.
For example, chlorine has two isotopes, chlorine-35 and chlorine-37, but in a natural sample you'd get 75% chlorine-35 and 25% chlorine-37. So chlorine's atomic mass is 35*75/100 + 37*25/100. If you work that out, you'll get 35.5, which is the figure on the periodic table.
The atomic mass of hydrogen is 1.00794 Why is this number not rounded off to 1?
because it 's the lightest element in the periodic table.
- The amu is defined based on carbon-12, so all other isotopes of elements are non-integer masses. This is sometimes referred to as the "mass defect".
- The atomic mass of an element is the weighted average of the atomic masses of its natural isotopes. For hydrogen these are hydrogen-1 and hydrogen-2 (deuterium).
What is the average atomic mass of phosphorus?
why would I know this sit would not give me the answer :[
How many significant figures is the atomic mass of lithium given?
The atomic mass of lithium is typically given with three significant figures, which are 6.94.
This is a homework assignment. It has been given to you to research and think out so that you will learn about and understand how the periodic table works.
WikiAnswers will not do your homework for you because of this.
If however there is some specific question you do not understand relating to your research about the periodic table, WikiAnswers will be happy to answer this specific question.
The diffirentiate of atomic mass and atomic number?
Atomic mass is defined as the sum of the no. of proton and neutron present in the nucleus of an atom and Atomic Number is defined as the no. of electrons present in the extra nuclear part of an atom .
BY; SHUBHAM KAKKAR
What does the atomic mass tell you about the element and it's protons and neutrons?
The atomic mass of an element represents the average mass of its isotopes, taking into account their abundance. It is the sum of the protons and neutrons in the nucleus of an atom. By subtracting the atomic number (number of protons) from the atomic mass, you can determine the number of neutrons in the nucleus.
What is the difference between Mass number and Relative of atomic mass?
Atomic mass is the average of the masses of the naturally existing (i.e. mixture of) isotopes of one specific element.
The atomic mass number is the sum of the protons and neutrons in the nucleus of an atom (specific for one specific isotope).
What is the difference between average atomic mass and mass number?
The average atomic mass is the weighted average of the masses of all naturally occurring isotopes of an element, taking into account their abundance. The mass number, on the other hand, represents the total number of protons and neutrons in the nucleus of an atom, and it is a whole number.
What element has the average atomic mass of 190.2?
Arsenic has an atomic mass of 74.9216 rounded to 74.922. It's chemical symbol is-As-and it's atomic number is 33.
Why is the relative atomic mass of martian oxygen different from that of oxygen obtained on earth?
The analysis of a sample of Martian air collected by the Phoenix Lander shows that the ratio of oxygen and carbon dioxide isotopes present in the atmosphere of Mars is very similar to that of Earth. Due to Mars' low gravity and lack of magnetic field, lighter isotopes are lost to space and so an older atmosphere will consist of mainly heavier isotopes.
In other words the oxygen on Mars would consist mainly of O18 while on Earth our oxygen consist mainly of O16.
What element has atomic mass of 16 and 8 neutrons?
If you had looked in the periodic table, you would have seen that the element Oxygen has an atomic mass of 16 (or more precisely 15.9994) and if you were to take that atomic mass and subtract the atomic number from it (i.e. 8) you would get a difference of 8 which is the number of neutrons it contains. In short, oxygen is that element.
An atom has 13 protons and an atomic mass of 27 How many neutrons does this atom have?
The atom in question has 13 protons, so is atomic number 13, which is Aluminium. Assuming that all of the atom's mass is formed from the protons and neutrons, and each of these have atomic mass 1, the number of neutrons is 27 - 13 = 14 neutrons. Almost all Aluminium is of this isotope.
What is the Atomic Mass of Lutetium?
Number of neutrons = Mass number - Atomic number
According to the periodic table, the "Mass number" of lutetium is 174.97, and the "Atomic number" is 71. Therefore,
Number of neutrons = 174.97 - 71 = 103.97 neutrons or approximately 104 neutrons.
Atomic mass tell about an atom?
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. Is a value denoting the total mass of all the protons, neutrons, and electrons in an isotope.
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.
Nonmetalic period 3 atomic mass 32?
The element with an atomic mass of 32 in period 3 of the periodic table is sulfur. It is a nonmetal with the chemical symbol S and is known for its distinct smell, pale yellow color, and role in various compounds in nature and industry.
The atomic mass of an atom consists of the mass of the?
The current definition amounts to 1/12 the mass of a carbon-12 atom. In the past (prior to 1961) it's had other definitions, sometimes depending on what field of study the author was in (for a while chemistry and physics defined it differently), so if you're dealing with historical data you've got to be careful.
Which element has the atomic mass 35.453 grams?
The element with an atomic mass of 35.453 grams is chlorine. It is a halogen gas with the chemical symbol Cl and atomic number 17.
What is the unit of atomic mass?
The unit of atomic mass is defined as 1/12 of the rest mass of the Carbon 12 atom and it is called a.u.m. or Da, read Dalton, from the name of the scientist that first introduced it.
Thus the rest mass of Ca 12 is exactly 12, while the rest mas of H is about 1.
The mass of many proteins is from 10 to 300 kDa.
Cl-35 75.8 percent and cl-37 24.3 percent what is atomic mass?
The atomic mass of chlorine can be calculated using the percentages given for Cl-35 and Cl-37. Multiply the mass of each isotope by its percentage, then add the results together to find the average atomic mass. For Cl-35 (mass 35) with 75.8% abundance and Cl-37 (mass 37) with 24.3% abundance, the atomic mass = (35 x 0.758) + (37 x 0.243) = 35.5.
Average atomic mass is closest to its most?
The average atomic mass of an element is closest to the mass number of the most abundant isotope of that element. This is because the average atomic mass takes into account the relative abundance of each isotope when calculating the overall mass.
