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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 do you calculate the number of electrons by the atomic mass and number?
You calculate the number of electrons by the atomic mass and number because elements have the same number of electrons as they do protons. The atomic number tells you the number of protons, which is also the number of electrons in a neutral atom. By using the atomic mass to find the number of neutrons, you can determine the overall charge and number of electrons in an atom.
What is the atomic mass of neon'?
The approximate mass is 11.
Technically you could express this in units of daltons as 11 Da (Daltons previously called amu, Atomic Mass unit, or as 11 (the dimensionless, relative atomic mass which chemists simply call atomic weight) .
Atomic Mass and Atomic Number of neon?
The Atomic number of Neon is 10 and the Atomic weight is about 20.18g rounded off to 2 decimal places.
If you don't have a periodic table you should get one most periodic tables have the atomic weight of all elements you need to know to around 2 decimals. I printed mine off Google images =)
For the simple reason that the most common isotope doesn't make up 100% of the element. If you use just that mass, your calculations will be off by anywhere from 0.5% to 3%. That doesn't sound like much, but when you are dealing with huge commodities of dangerous chemicals that need to be in the exactly specified mix or creating drugs that require a precise value of medication to prevent under- or overdosage, you had better be closer than 0.5%.
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.
What is the formula mass of nitrogen monoxide in atomic mass?
The formula mass of a compound is the sum of the atomic masses of all the atoms in the chemical formula. For nitrogen monoxide, the chemical formula is NO. The atomic mass of nitrogen (N) is approximately 14.01 g/mol, and for oxygen (O) is approximately 16 g/mol. Therefore, the formula mass of nitrogen monoxide (NO) is approximately 14.01 + 16 = 30.01 g/mol.
Which element or elements have an atomic mass between 15 and 19?
Oxygen (15.9994)
Flourine (18.9984032)
What is the atomic mass in Hindi?
The atomic mass (ma) is the mass of a specific isotope, most often expressed in unified atomic mass units.[1] The atomic mass is the total mass of protons, neutrons and electrons in a single atom.[2]
The atomic mass is sometimes incorrectly used as a synonym of relative atomic mass, average atomic mass and atomic weight; these differ subtly from the atomic mass. The atomic mass is defined as the mass of an atom, which can only be one isotope at a time and is not an abundance-weighted average as in the case of atomic weight. In the case of many elements that have one dominant isotope the actual numerical similarity/difference between the atomic mass of the most common isotope and the relative atomic mass or standard atomic weights can be very small such that it does not affect most bulk calculations-but such an error can be critical when considering individual atoms. For elements with more than one common isotope the difference even to the most common atomic mass can be half a mass unit or more (e.g. chlorine). The atomic mass of an uncommon isotope can differ from the relative atomic mass or standard atomic weight by several mass units.
How does the nuclear radius vary with atomic mass number?
The nuclear radius R is related to the mass number A as follows:
R=RoA1/3,where Ro =constant=(1.2 to 1.7) x 10 -15
Thus nuclear radius varies as A1/3
Why does beryllium have an atomic mass of 9.01 instead of 9?
There are two main reasons why an element has an atomic mass that is non-integral.
The first reason is that naturally occurring elements often consist of more than one isotope, and the mass given is actually the average mass. A common example is Chlorine, which has two isotopes, 35Cl and 37Cl, in a 3:1 ratio and the average mass ends up at around 35.5.
The other reason is a little more complex. The mass of an atom comprises the sum of the mass of the neutrons, the protons, the electrons and the nuclear binding energy.
For simplicity, let us look at the mass of helium and use the old system where hydrogen has a defined mass of 1.000. You might think that helium (two protons, two neutrons, two electrons) would have a mass of exactly 4.000. However:
1. The mass of a hydrogen atom is the sum of 1 proton + 1 electron. A helium atom has twice this plus two neutrons
2. The mass of a proton, or that of a proton plus an electron, is different from the mass of a neutron.
3. When hydrogen/deuterium/tritium atoms combine to form helium atoms, energy is given out, and enough energy is given out that the equivalence of mass and energy (calculated through E=mc2) results in a significant loss of mass from the final atom.
In combination, these results mean that the mass of one atom is never a simple multiple of another, so with the exception of the atom that we actually define as having a specific mass (as we currently define oxygen to have a mass of 16.0000 amu), no atom will never have an integral mass.
In the case of Beryllium, the mass of 9Be is not exactly 9.0000, plus there are trace amounts of 10Be in naturally occurring samples that take the average mass up to a fraction over 9.00.
What is the atomic mass when there are 45 neutrons and 35 electrons?
The atomic mass of an element is determined by the sum of its protons and neutrons. If an atom has 45 neutrons, the atomic mass would be the sum of the number of protons and neutrons, assuming neutral charge. Since the number of protons is not provided, the atomic mass cannot be determined with the information given.
Which of the atomic particles have a mass that is 1836 times smaller than one atomic mass unit?
Electrons have a mass that is approximately 1836 times smaller than one atomic mass unit. Electrons are fundamental particles with a mass of about 9.1 x 10^-31 kilograms, which is considered negligible compared to the mass of protons and neutrons.
Which one particle has a mass of approximately atomic mass unit and a unit positive charge?
none of the particles are 1g. (g stands for gram which is about the weight of a small paperclip.) however the proton has a positive charge.
How many neutrons are does yttrium have with an atomic number of 39 and atomic mass of 89?
Yttrium has 50 neutrons. To find the number of neutrons, subtract the atomic number (39) from the atomic mass (89): 89 - 39 = 50 neutrons.
The element with isotopes of approximately 10 amu and 11 amu is boron (B) on the periodic table. Its isotopes include Boron-10 and Boron-11.
The element with 8 protons has an atomic number of 8. Adding protons and neutrons gives you the atomic mass, so the element has an atomic mass of 8 + 9 = 17. Therefore, the correct answer is C) 8 and 17.
Atoms are made up of protons, neutrons, and electrons. The atomic mass listed on the periodic table is an average of all the isotopes of an element, which includes the mass of the protons and neutrons. Therefore, the atomic masses listed for oxygen (16) and hydrogen (1) are in daltons.
How do you determine the atomic mass of chlorine?
Well, the CI atomic number is 17. The atomic mass is 35.4527 amu.
There are two stable isotopes of chlorine with relative mass numbers 35 and 37. As the relative abundance of these isotopes are 75% and 25% respectively, the molar mass of chlorine is considered as 35.5 g/mol.
Atomic mass of an atom is determined by the weight of?
The atomic mass of an atom is determined by the total number of protons and neutrons in its nucleus. Protons and neutrons contribute to the majority of an atom's mass, electrons have negligible mass in comparison. The atomic mass unit (amu) is used to express atomic mass, with 1 amu approximately equal to the mass of a proton or neutron.
A reasonable value for the atomic mass of the missing element can be estimated by finding the average atomic mass of the elements on either side of the missing element in the periodic table. This estimation assumes a gradual increase in atomic mass across the periods in the table.
Is Kinetic Energy dependent on Atomic Mass?
For a singe molecule, Yes:
KE = (1/2)mv^2
Where m is mass, and v is velocity or speed of the center of the mass.
-or-
by relating to momentum:
KE=(p^2)/2m
Where p is momentum and m is again mass.
However, the AVERAGE kinetic energy of one mole of molecules does NOT depend on mass:
KE = (3/2)RT
where R is the molar gas constant, and T in temperature in Kelvin.
The average molecular kinetic energy for an ideal gas, depends solely on temperature.
What can be added or taken away from an atom to change the atomic mass?
The atomic mass of an atom can be changed by adding or removing subatomic particles. By adding or removing protons, neutrons, or electrons, the atomic mass will be altered. Changing the number of protons will change the element, while changing the number of neutrons will create isotopes of the same element.
What is the atomic mass of ununseptium?
117. For chemicals that are unnamed, use the prefic after the to "un-"s to figure out the last digit. sept-=7. The two "un-"s both indicate one. So, one one seven, or 117
actually, 117 is the atomic number, the mass is approx 292
Where is the atomic mass found?
the atomic mass is found mostly in the nucleus since most of the atom's space is empty space and electrons weigh about 0.005 relative to a neutron which weighs about 1.675 multiplied times 10-24 grams
