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Protons have a positive charge and weigh 1 AMU
Neutrons have a neutral charge and weigh 1 AMU
Electrons have a negative charge and 1184 electrons weigh 1AMU so they are thought to add nothing to the mass of an atom.
You may want to check out Bohr's model or the duet/octet rule.
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Which contributes more to an atom's mass electrons or protons?
The proton contributes more even though there are equal numbers of both electrons and protons. The mass of a proton is one thousand times greater than the mass of an electron. Thus, the proton contributes more.
Protons are so much more massive than electrons that you can neglect the mass of electrons when determining the mass of an atom?
Atomic mass is based on the proton and neutron. For the most part the mass of an electron is infinitesimally small.
Where is the most of the mass in an atom?
Most of the mass in an atom is in the nucleus. The protons and neutrons are about the same weight, 1 amu. The elecrtons are 1/1840 of the mass of an proton. Neutrons are 2000 times heavier than electrons and protons have an equal mass of neutrons
The region in an atom that contains most of the mass is called?
Most of the atom's mass is concentrated in the nucleus.
What do the dots represent and what does the number of dot tell us about each atom?
There are three kinds of "dots" in a atom. Electrons, neutrons, protons. Electrons have a negative charge, neutrons have no charge, and protons have a positive charge. The numbers of dots represent what kind of atom it is, as on the periodic table of the elements. The atomic number and mass tells you how many electrons/neutrons/or protons there are.
Where is almost all of the mass in an atom is located?
Approximately all of the atom's mass is in the nucleus. The electrons contribute almost zero.No atom has more than 100 electrons, but eachproton or neutron in the nucleushas the mass of more than 1,800 electrons.
Why is it not necessary to include electrons when determining the mass of an atom?
While electrons do technically have a measurable mass, the proportion of the overall mass of the atom contributed by the electrons is negligible. The protons and neutrons in the nucleus contribute the vast majority of the mass of the atom and thus are the only parts considered.
Where is the most of the atoms mass located?
Approximately all of the atom's mass is in the nucleus. The electrons contribute almost zero.No atom has more than 100 electrons, but eachproton or neutron in the nucleushas the mass of more than 1,800 electrons.
What particles make up the mass of the atom?
Protons and neutrons, the particles that make up atomic nuclei, are the ones responsible for almost all of the mass of an atom. As the electron has less than 1/1800th the mass of a proton, a whole flock of electrons won't significantly change the mass of an atom. We look to the protons and neutrons (called nucleons when they are being considered as components of an atomic nucleus) to contribute to the mass of an atom, and they will be considered when we derive the atom weight of an element.
Is the number of electrons the same thing as the atomic mass in an atom?
No, electron count really doesn't have anything much to do with atomic mass. Let's look. Most of the mass of any atom is concentrated in the nucleus. It's the protons and neutrons there that give the atom "weight" and the electrons contribute almost nothing. Additionally, electrons can be loaned or borrowed by atoms, and this changes their mass very little. The number of electrons is not very "connected" to atomic mass of an atom.
What subatomic partices contribute to the mass of volume?
Electrons, due to their movement around the nucleus.
What is the atomic mass of a electron?
That's going to be somewhere in the neighborhood of 0.00054 . About 1,840 electrons have the same mass as one neutron or proton. So, in the largest naturally occuring atom ... Uranium ... with 92 electrons, the electrons don't even contribute 1 count to the mass of the whole atom.
What subatomic particle contributes alomst no weight to an atom?
The subatomic particles that contribute most almost no weight to an atom are electrons at various energy levels. Isotopes of the same element differ from each other only by the number of neutrons.
What part of an atom is not used in calculating the mass number?
All parts of the atom weigh something but when doing calculations electrons are said to have a mass of 0. This is because they actually have a mass of 1/1836 amu which is insignificantly small and so it is disregarded.
Where is most of the atoms mass found?
An atom's mass is concentrated in its nucleus, which is located in the center of the atom. Protons and neutrons within the nucleus are responsible for its mass; the electrons, which are located outside of the nucleus, don't contribute to the mass of the atom.
Does an atom has mass?
Yes, atoms are made up of protons, neutrons, and electrons. Protons are neutrons each weigh 1 Atomic Mass unit (amu). Electrons weigh about 1/1836 of an amu and don't really contribute to the weight of an atom at all. The more protons and neutrons an atom has the more it weighs.
An element's atomic mass does not include the mass of its?
...electrons, as they account for a negligible mass relative to the atom as a whole (electrons make up 1/1840th of the total mass, to be precise).
