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Atomic Mass
Atomic mass is the mass of protons, neutrons, and electrons in a single specific atom.
1,752 Questions
When carbon-14 decays and emits a beta particle what is the atomic mass on the new nucleus?
When carbon-14 undergoes beta decay and emits a beta particle, the atomic number increases by one as a neutron in the nucleus is transformed into a proton. This results in the formation of a new nucleus of nitrogen-14 with the same mass number as the original carbon-14 nucleus.
Describe what mendeleev found when he organized the elements by atomic mass?
Mendeleev of course only made use of existing information, merely arranged it a two-dimensional form.
# Relationships between the chemical and physical properties of families of elements # Holes in the table where as yet undiscovered elements were to be found. He found that the properties of an element were periodic and showed a pattern.
Based on this observation, he devised the table in such a way so as to arrange elements with similar chemical properties in columns forming groups.
Is the meaning of relative atomic mass is the same as atomic weight?
Yes, the relative atomic mass and atomic weight are used interchangeably to represent the average mass of an element's atoms compared to the mass of a carbon-12 atom. This value is unitless and is typically represented in atomic mass units (amu).
Nitrogen has an atomic mass of 14 and an atomic number of 7 so the number of neutrons must be?
The atomic mass of an atom is the total mass of its particles. The atomic number is the number of protons in the atom's nucleus.
To find the number of neutrons in an atom, we take its atomic mass (the total mass of its particles) and subtract its atomic number (the number of protons and electrons in the atom).
A: Lithium has an atomic mass of 7 and an atomic number of 3 so the number of neutrons is equal to 4. (7 - 3 = 4)
Calculate the atomic mass of an element?
By taking the wieghted averages of naturally occurring isotopes of that element. :)
What is the atomic mass for vanadium?
The atomic number of vanadium (V) is 23. The atomic weight of V is 50.9415 grams per mole.
To be honest, as far as I know, no.
However, I don't think it's a horrible lot you have to remember... and I'd be surprised if you don't get a periodic table when going to an exam.
Well if you can remember the atomic number the atomic mass is a little more or less than the doubled atomic number.
Atomic numbers are pretty simple to memorize. If your test is multiple choice even easier. Ask your teacher if you can use a blank periodic table unless that's the test
What is the atomic mass of milk?
Milk is a solution of many different atoms. Atomic mass only refers to the mass of a single type of atom. Milk may have a "molecular mass" but you need to determine all of the different atoms in milk and then add their masses together.
An atom has 14 protons and 13 neutrons what it its atomic mass?
The atomic mass is the sum of the number of protons and neutrons in an atom. In this case, the atomic mass would be 14 (protons) + 13 (neutrons) = 27.
The atomic mass or mass number equals what?
This is nuclear fission. In fission, an atom splits, producing two smaller atoms, neutrons, other particles, and energy. The number and types of nucleons (protons and neutrons) do not change in the process, but the actual isotopes of the daughter atoms is governed by chance.
The atomic mass of an element is determined by its total number of?
protons and neutrons in the nucleus. It is calculated by adding the number of protons and neutrons in an atom. Electrons do not significantly contribute to the atomic mass due to their much smaller mass compared to protons and neutrons.
What does amu mean in the atomic mass of an element aside of it?
AMU stands for atomic mass unit. It is a unit of mass used to express atomic and molecular weights. One atomic mass unit is defined as a mass equal to one twelfth the mass of a carbon-12 atom.
Naturally occurring lithium contains two isotopes. The common one has an atomic mass of 7. About one per cent of the lithium has an atomic mass of 6.
The atomic mass of Lithium-Li is 6.941 grams.
59 = # of protons and # of electons
59 protons make up 59 of the mass number (electons have an insignificant mass), so the rest of the mass must be from neutrons:
96 - 59 = 37 neutrons
The atomic mass of an element depends upon the?
1. atomic number and the ratios of its naturally occurring isotopes.
2. atomic number and the half-lives of each of its isotopes.
3. masses and the ratios of its naturally occurring isotopes.
4. masses and the half-lives of each of its isotopes.
answer: 3. masses and the ratios of its naturally occurring isotopes.
What is the mass number atomic mass of the most common isotope of argon?
Argon is a non metal element. Mass number of it is 40.
An element's atomic mass does not include the mass of its?
An element's atomic mass does not include the mass of its electrons. Electrons have such a small mass compared to protons and neutrons that they are not typically included in calculations of atomic mass.
Gram atomic mass of 1 mole of aluminum?
This question is a little confused. The gram-atomic mass for aluminum is approximately 27 (look at a periodic table if you want more significant figures; I don't recall them off the top of my head). It doesn't matter if you have a mole or a planet-sized mass of the stuff, the gram-atomic mass is always going to be the same.
What is the difference between atomic mass number and atomic number?
Atomic mass number is the average atomic mass for that element, which is : All the isotopes' masses known for that element averaged up. Atomic number is the element's "identity", the number of protons the element and all its isotopes have. All the isotopes of a given element will have different number of electrons and neutrons, but the protons of the element never will change.
Atomic mass is determined by the number of protons plus the number of?
neutrons in an atom's nucleus. It is measured in atomic mass units (amu) and provides the total mass of an atom. The atomic mass is approximately equal to the sum of the protons and neutrons in the nucleus, as the mass of electrons is negligible.
The atomic mass of the atom is made up of which two particles?
The atomic mass of an atom is made up of protons and neutrons. Protons have a positive charge and are found in the nucleus of an atom, while neutrons have no charge and are also located in the nucleus. Electrons, which have a negative charge, are found orbiting the nucleus but do not significantly contribute to the atomic mass.
The average atomic mass of an element is the weighted average of the masses of the isotopes of that element, taking into account their natural abundance. It is usually expressed in atomic mass units (u) and can be found on the periodic table for each element. The average atomic mass provides a more accurate representation of the mass of all the isotopes of that element.
What particle contributes a negligible amount to the atomic mass?
There are a number of particles of particularly low mass. Electrons have much less mass than either protons or neutrons, and so are negligible in calculating the mass of an atom. However, electrons are still much heavier than neutrinos or photons, which are even more negligible in mass.
How was the atomic number and the atomic mass determined?
The atomic number of an element is determined by the number of protons in the nucleus, which can be identified through methods like spectroscopy and X-ray diffraction. Atomic mass is determined by the total number of protons and neutrons in the nucleus, which can be calculated based on the element's isotopic composition and their respective masses.
