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Neutrons.
Neutrons and Protons have approximately the same mass, and electrons have comparatively almost no mass!
Protons do have mass, but not very much. A proton's mass is 1.66 x 10-24g, and it takes 6.02 x 1023 of them to make a gram (with thanks to the Italian chemist Avogadro, whom that number is named for).
What else can I help you with?
Where can most of the mass in an atom be found?
Most of the mass in an atom can be found in the nucleus, which houses the protons and neutrons. Protons and neutrons are much more massive than electrons, which orbit the nucleus in the electron cloud.
What is the size difference between protons electrons and neutrons?
Protons and neutrons have approximately the same size and mass. A neutron is slightly heavy than a proton to be more accurate. In general we can say that they both have same mass which is 1 amu. The actual difference is 2.31 x 10-30kg), but are different charge (+1 and zero respectively). Also, an electron and positron have the same mass and size and more generally, any particle will have the same mass as its antiparticle.
What is the structure of the atom and the position of protons neutrons and electrons?
Protons and neutrons can be found in the centre of the atom in the nucleus. Electrons orbit round the nucleus in shells/orbits and are extremely small compared to the rest of the atom. Protons have a positive +1 charge and neutrons have no charge and are neutral. Electrons have a negative -1 charge. Protons and neutrons give the atom its mass. Each shell has a maximum number of electrons it can take. In the first shell it is 2. In all other shells (up to calcium) the maximum number is 8. An atom can gain or lose electrons, becoming what is known as an ion. An ion is nothing more than an electrically charged atom. Adding or removing electrons from an atom does not change which element it is, just its charge. The number of electrons equals the number of protons. The number of protons is the roton/atomic number. The number of neutrons can be found by subtracting the atomic mass from the atomic number (as the atomic mass it both the protons and neutrons combined.)
What subatomic particles contain most of the mass?
The three types of subatomic particles known as the proton, the neutron, and the electron have masses of 1.6726 × 10−27 kg, 1.6749 × 10−27 kg, and 9.1094 × 10−31 kg, respectively. As you can see, protons and neutrons have roughly the same mass, and both of their masses are significantly greater than that of an electron. So, for atoms containing more protons than neutrons, the protons will make up the greatest percentage of mass in that atom. For atoms containing more neutrons than protons, of which there are a whole lot more of, the neutrons will make up the greatest percentage of mass in that atom. EDIT: Most of the mass in an atom comes from the energy in the Strong Force, which holds the nucleus together. Remember that mass and energy are equivalent.
In subatomic particles do protons and neutrons have the same mass?
No, protons and neutrons do not have the same mass. Protons have a slightly smaller mass than neutrons. The difference in mass between the two particles is due to the different composition of quarks that make up each particle.
Why is the atomic mass the same as the total number of protons and neutrons in the nucleus?
The neutrons and protons are in the nucleus which determines the element/isotope. The electrons however define the net charge (ie. positive if there are less electrons then protons and negative if more) and it can be changed more easily, than changing the amount of neutrons . Another reason is that electrons have a tiny mass compared to the protons and neutrons and it wouldn't change the mass number by all that much.
How does an atom of sodium has a larger mass than a atom of neon. how is this possible when neon has so many more valence electrons?
sodium has more protons and neutrons. electrons have practically no mass, valence electrons are just outer orbital electrons. sodium has 11 protons, 11 electrons, and 12 neutrons. Mass is 23. neon has 10 protons, 10 electrons, and 10 neutrons. Mass is just 20. The neon atom has 10 protons and 10 neutrons for a mass number of 20. The sodium atom has 11 protons and 12 neutrons for a mass number of 23. The number of valence electrons has no bearing on mass number or atomic weight.
Which particles determine the mass of an atom?
The atomic mass unit is defined to be 1/12 of the mass of a carbon-12 atom. Atomic masses can determined by weighing molar amount of an isotope. Absolute masses (in kg) are determined by measuring the amount that charged atoms are deflected by magnets, since if you know the charge you can calculate mass from the amount of deflection.
What makes an element more massive?
The number of protons and neutrons in the nucleus of an atom determines its mass. Elements with more protons and neutrons are more massive. Additionally, the mass of an element can be influenced by the presence of isotopes, which have varying numbers of neutrons.
Who has the smallest mass electrons protons or neutrons?
Of the neutron, proton, and electron, the electron has the smallest mass.
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.
The atomic mass of the atom is made up of which two particles?
Protons and neutrons make up almost all the mass of an atom. Consider that the proton is about 1836 times more massive than an electron, and that the neutron is slightly more massive than the proton, and it becomes crystal clear.
Which subatomic particles contribute the most to the mass of potassium?
The protons and neutrons contribute the most to the mass of potassium. Protons have a positive charge and determine the element's identity, while neutrons provide additional mass without affecting the charge. Electrons have negligible mass compared to protons and neutrons.
Does the volume of matter come from protons or electrons?
The number of electron orbitals is where the volume of matter comes from. The more electrons and orbitals, the more volume. The mass comes from the protons and neutrons.
Is the mass number equal to the number of protons and electrons?
No, it isn't. The mass of an electron is significantly smaller than that of a proton.The mass of 1,800 electrons is about the same as the mass of one single proton.The antiparticle of the electron, the positron, has the same mass as the electron.the mass of the electron is not the same to the mass of the proton
Where can most of the mass in an atom be found?
Most of the mass in an atom can be found in the nucleus, which houses the protons and neutrons. Protons and neutrons are much more massive than electrons, which orbit the nucleus in the electron cloud.
Which series lists particles in order from smallest to the greatest mass?
The series that lists particles in order from smallest to greatest mass is: electrons, neutrinos, protons, and neutrons. Electrons are the lightest, followed by neutrinos, which have an extremely small mass but are still heavier than electrons. Protons and neutrons, which are components of atomic nuclei, have significantly greater masses, with neutrons being slightly more massive than protons.
