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Atomic Mass
Atomic mass is the mass of protons, neutrons, and electrons in a single specific atom.
1,752 Questions
What is the atomic mass of ununpentium?
After the IUPAC tables from 2009 the atomic mass of ununpentium is [289].
What composes an element's atomic mass?
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.
Is atomic mass unit a SI unit of an atomic mass?
The atomic mass unit is not a SI unit.
An atomic mass unit is equal to 1/12 from the atomic mass of the isotope 12C.
What is the atomic mass the weighted average of?
It's the averaged weight of all of the known isotopes of an element. Elements have versions of itself that have the same number of protons and electrons, but different number of neutrons. Since protons and neutrons have a mass of 1 amu (atomic mass unit), you change the neutron number, you change the mass . . . even though the element is still the same. Ex: Carbon 14 and Carbon 12 are isotopes of carbon. Both carbon elements, but they each have a different number of neutrons (8 vs 6), so they have different masses.
What element has an atomic mass of 50.9?
Vanadium has an atomic weight of 50.9415 on the periodic table.
Why is the atomic mass of nobelium written as a whole number in parentheses instead of a decimal?
259 is the mass number of the isotope with the longest half life. This system is a convention from IUPAC for elements having very unstable and artificial isotopes.
What is the Atomic mass of astatine?
The atomic mass of astatine is 209.9871 atomic mass units (amu). The atomic mass is given for the longest lived isotope of astatine, which is astatine-210, with a half life of 8.3 hours.
Hydrogens atomic mass number and relative atomic mass?
Hydrogen is a non metal element. Atomic mass number of it is 12.
What is the atomic mass of a human?
The atomic mass of a human is the sum of atomic masses of all the elements that make up the body. On average, a human body is composed mostly of oxygen, carbon, hydrogen, and nitrogen, with trace amounts of other elements. The total atomic mass of a human is about 30 kilograms.
What is the relative atomic mass of potassium?
the relative atomic mass for the element potassium is 39.0983
Can the atomic mass of an element change?
For elements with multiple natural isotopes the precise atomic mass could vary from place to place. Depending on the ratio of those isotopes. Living systems are a natural way isotopic concentration change in some elements. Lighter isotopes react faster and living systems will tend to concentrate them. Extraterrestrial sources of elements could have significantly different isotopic composition than Earth's. Nuclear decay could change some isotopes to different elements. Thus changing the isotopic ratios.
Atomic mass of cholrine is 355 and its molecular mass 71 the atomicity is what?
The atomic mass of chlorine is not 355 it is 35.5 (approx). So, if the molecular mass is 71 then the atomicity is 71/35.5 = 2.
How do you get the atomic mass and and atomic number?
it is simple. all you need to do is look in the periodic table the numbers above and under the letter.
Atomic number is determined from the number of protons in the nucleus. Atomic mass is determined from the number of protons AND neutrons in the nucleus. Since elements have multiple isotopes with differing numbers of neutrons, the atomic mass reported on periodic charts is usually the average atomic mass. As the first person who answered this question pointed out, you can usually find the atomic number by looking for a number above the atomic symbol for the element in the the table (H for hydrogen, C for carbon, Fe for Iron, Au for gold, etc.). Sometimes the number will be below the symbol but in bold font. When the periodic table gives an atomic mass, it is usually given under the atomic symbol and is almost always some kind of decimal number that is always greater than the atomic number, for example: Carbon has an atomic number of 6and an atomic mass of 12.0107 amu.
Atomic number : 26Atomic mass : 55.845
Net charge : +3
Why is atomic mass always a fraction?
It's an average number allowing for the relative abundances of different isotopes.
it is 8 because all you have to do is subtract 4 out of 12 and what does that give you...8 pretty simple stuff <3
What is the average mass of an element with isotopes a b and c?
a*% abundace + b*%abundance + c*%abundance
What is the average atomic mass of scandium?
Scandium is a meta element. Atomic mass of it is 45. Atomic number of it is 21.
