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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 relative atomic mass of lead?
The element lead consists of four naturally occurring isotopes with atomic masses 203.97302, 205.97444, 206.97587, and 207.97663 . The relative abundances of these four isotopes are 1.4, 24.1, 22.1, and 52.4%, respectively.
What element has an atomic mass of 9.01218?
Silicon has a Atomic Mass number (weight of protons and neutrons) of 28.09. Its actually 28.0855
Did Mendeleev organize the elements by atomic mass or atomic number?
Mendeleev arranged elements in order of increasing mass. Later modern periodic table was discovered that contains elements arranged by atomic number.
What does the atoimc mass of an element represent?
The atomic mass of an element represents the average mass of an atom of that element, taking into account the abundance of different isotopes of the element. It is measured in atomic mass units (amu) and is listed on the periodic table below the element's symbol.
Was the modern periodic table organized according to atomic mass?
Initially, the modern periodic table was organized based on atomic mass. However, it was later revised to be arranged according to atomic number, which is the number of protons in an atom's nucleus. This change led to a more accurate and logical representation of the periodic trends.
When you subtract the atomic number from the atomic mass of any element you get what?
Atomic mass= Atomic no. + no. of neutrons
So when the atomic no. is subtracted from the atomic mass, the result would be equal to the number of neutrons present in the nucleus of the atom of the element.
What is the atomic mass of mendelevium?
After IUPAC (2009) the standard atomic weight of mendelevium is [258].
Which best describes the definition for the atomic mass of an element?
The atomic mass of an element is the average mass of an element's isotopes, weighted by their natural abundance. It is expressed in atomic mass units (u) and is often close to the mass number of the most abundant isotope of the element.
What is the atomic mass of this element of 197.97?
The atomic mass of an element is the weighted average of the masses of its isotopes, taking into account their abundance. If the atomic mass of an element is 197.97, it represents the average mass of all naturally occurring isotopes of that element.
The atomic mass of an element is not always an integer because it considers the average mass of all isotopes of that element, taking into account their abundance. Since isotopes have different masses, the weighted average can result in a non-integer value. Additionally, the presence of isotopes with different masses means that the atomic mass is a weighted average influenced by the abundance of each isotope.
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What is the relationship between mass number and atomic mass of an element?
Each isotope of an element has an atomic mass. The average of all the atomic masses of an element's isotopes gives an elements atomic weight. For this reason, atomic weights are decimal numbers.
How would you get the atomic mass for scandium?
The conversion factor you need for this problem is Avogadro's number.
(6.02 x 1023 atoms scandium/1 mole scandium) = 1
... OR ...
(1 mole scandium/6.02 x 1023 atoms scandium) = 1
Since you want to end up in units of moles of Sc, this goes in the numerator (on top). You want to convert from atoms Sc, so this goes in the denominator (on the bottom).
atoms Sc1 mole Sc = moles Sc6.02E+23 atoms Sc
How did they come up with the symbols for atomic mass and atomic number?
The symbol for atomic mass is "A," which stands for the mass number of an atom. The symbol for atomic number is "Z," which represents the number of protons in an atom's nucleus. These symbols were established by chemist Frederick Soddy in the early 20th century to help organize and describe information about elements and isotopes.
Which element has a greater atomic mass?
The element with the greater atomic number will have a greater atomic mass. Atomic mass is the sum of the protons and neutrons in an atom's nucleus, and since the number of protons increases with atomic number, so does the atomic mass.
What is the identity and atomic mass of an atom containing 29 electrons 34 neutrons and 29 protons?
This is a single specific isotope of copper (element 29).
The isotope 63Cu makes up about 70% of the copper on Earth, and most of the remaining 30% is the 65Cu isotope. The isotope 64Cu is also known, but this atom is not stable, having a half-life of just 12.7 hours.
What is the atomic mass of element X if 2.43 g XCl3 contains 1.26 g X?
The molar mass of XCl3 is the sum of the atomic mass of X and 3 times the atomic mass of Cl. Given that 2.43 g XCl3 contains 1.26 g X, we can calculate the molar mass as follows:
2.43 g XCl3 - 1.26 g X = 1.17 g Cl
From the periodic table, the atomic mass of Cl is approximately 35.45 g/mol. Since XCl3 contains 3 chlorine atoms, the molar mass of XCl3 is 3*35.45 + atomic mass of X. Knowing that 1.17 g Cl is present in 2.43 g XCl3, It is possible to calculate the fractional composition of Cl and use it to find the atomic mass of X.
What is the difference between mass number relative atomic mass and average atomic mass?
The mass number is the total number of protons and neutrons in an atom's nucleus. Relative atomic mass is the weighted average mass of all the isotopes of an element, taking into account their natural abundance. Average atomic mass is the weighted average mass of an element's isotopes in a given sample, considering their abundance in that sample.
What is the number of atomic mass in a atom?
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 atomic mass of an element equal to atomic number or number of protons?
Answer:
The atomic mass is NOT equal to both 'atomic number' and 'number of protons .
The atomic mass of an element is by approximation equalto, but not exactly, the sum of protons and neutrons in the nucleus of the atom.
The number of protons is given by the atomic number, not atomic mass.
So, only the atomic number of an element AND the number of protons are equal. The atomic mass is also depending on the number of neutrons.
More explicative:
The atomic mass of an element refers to a particular isotope of that element, and is equal to the sum of the protons and neutrons in the nucleus of atoms of that isotope.
For example, carbon-12 atoms have 6 protons and 6 neutrons, while carbon-14 atoms have 6 protons and 8 neutrons.
Atomic weight, which is shown on the Periodic Table is a weighted average of the atomic masses of all the different isotopes of each element.
For example, the atomic mass of C-12 is 12.0000 a.m.u. and the atomic mass of Carbon is 12.0107(8) g/mol
From the Periodic Table you can only tell the number of protons in the atoms of all of the isotopes of a given element, because the number of protons defines the element, and is the element's atomic number. However, you cannot tell the number of neutrons from the Periodic Table. You would have to look up the atomic masses of all the isotopes of each element in some sort of reference. The atomic number of an element is equal to the number of protons in the nucleus of an atom.
To find the number of moles in 6.22 micrograms of Uranium, you first need to calculate the number of moles using the formula: Moles = Mass / Molar mass. The molar mass of Uranium is 238.0 g/mol. Convert 6.22 micrograms to grams by dividing by 1,000,000. Then, divide the mass in grams by the molar mass to find the number of moles.
Tungsten is a metal element. Atomic mass of it is 184.
