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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 is the atomic mass of fluorine not 19.000?
The atomic mass of fluorine is not exactly 19.000 because it is an average of all the isotopes of fluorine found in nature, taking into account their relative abundance. Fluorine has multiple isotopes with slightly different masses, which results in the average atomic mass being around 18.998.
Which mass number or atomic number determine what element an atom is?
The identity of the element is determined solely by the atomic number, which is the number of protons.
What is the Atomic weight of the Oxygen?
The atomic weight is 15.9994 (slightly less than the atomic number 16).
What element has atomic mass of 201?
- Gold-201 is a beta/gamma emitter with a 26 minute halflife.
- Mercury-201 is stable and makes up 13.22% of natural Mercury.
- Thallium-201 is a gamma emitter decaying by K capture with a 72 hour halflife.
- Lead-201 is a gamma emitter decaying by K capture with a 8.4 hour halflife (or less depending on isomer).
Other elements can be produced with an AMU number of 201, but there halflives are really too short to be of practical interest.
What equals on atomic mass unit?
One-twelfth the mass of a carbon-12 atom or 1,660538921(73)×10−27 kg.
the mass of an electron
What is the rounded atomic mass for zinc?
Zink is a meta element. Atomic mass of it is 65. Atomic number of it is 30.
What is the mass and atomic number for N?
By N, I assume you mean Nitrogen. Nitrogen's Atomic number is 7, and its atomic mass is ~14.011.
What is the atomic mass for the element carbon is 12.011?
the atomic mass of just pure carbon would be twelve. the atomic mass is only effected by the number of protons and numbers of nuetrons
Is an element's atomic mass measured in kilograms?
No, an element's atomic mass is typically measured in atomic mass units (amu) or grams per mole (g/mol). Atomic mass units represent the mass of an atom relative to the unified atomic mass unit, while grams per mole represents the average mass of one mole of atoms of a particular element.
What is the atomic mass of Unbibium?
With the atomic number 122, it's isotopes have the masses 292, 297, 298, 300, 302, 303, 304, 306, 308, and 337 amu. The most abundant of which is 304, with 182 neutrons. Unbibium is naturally found in Thorium (atomic number 90; average atomic mass 232.0).
-Topher Ratliff; December 10th, 2012
edited same day.
What the distinction between atomic mass and atomic number?
the number of positive charges or protons in the nucleus of an atom of a given element, and therefore also the number of electrons normally surrounding the nucleus. (atomic number) The mass of a given atom or molecule, expressed in atomic mass units. (atomic mass)
What is the diameter of a copper atom with atomic mass is 63.5 and density is 8.93ESP3 kgm-3?
The product of the units atomic mass (g/mol), Avogadro's number(mol/atom), 1/density (m^3/kg) and, 1(kg/g) yield the volume of a copper atom. (63.5*(1/6.022E23)/(8930*1000)= 1.12E-23m^3. The volume of a sphere is given as 4(pi)(r^3)/3. Solving for r: r=(3*1.12E-23/(4pi))^(1/3)=1.41E-10m. Multiplying by 2, d = 2.42E-10m.
What is the atomic mass of granite?
Granite does not have an atomic mass, because it is not an element.
Granite is a solid mixture of both crystalline and noncrystalline minerals.
How is a number of moles of an element determined from a known mass?
The number of moles is mass in g/molar mass in g.
It is difficult to be sure what the question is about because it has been truncated.
However, it is true that the atomic mass (or standard atomic weights) increases with atomin number. There are, of course, isotopes of elements with a low atomic number which are heavier than atoms of higher atomic number. But there are some examples where the average mass is not in the expected sequence.
Are most atoms their mass number is the same as their atomic number?
No. In most atoms the mass number is at least twice the atomic number. A mass number that is the same as the atomic number would indicate a nucleus with no neutrons. Such a nucleus would be highly unstable except in the case of the hydrogen-1 nucleus, which consists of a single proton. In most other stable nuclei there are at least as many neutrons as their are protons. The mass number is the sum of the number of protons and the number of neutrons.
What is the mass of 1 mol of rubidium?
According to the periodic table, the atomic mass of rubidium, Rb is 85.5. This is numerically equal to the molar mass in g/mol. Therefore the mass of 1 mol of Rb is 85.5g.
Mass of 1 mol means the molar mass of the element. Molar mass of Rubidium is 85.47 gmol-1. Rb is in the 1st group.
