0
The electrons are of such insignificant mass relative to that of the protons and neutrons, therefore we do not count them when calculating Atomic Mass, so the mass = 2 protons + 2 neutrons = mass number 4.
Wiki User
∙ 15y ago
Wiki User
∙ 7y ago1 amu is defined as one twelfth of the mass of an unbound neutral atom of carbon-12 in its nuclear and electronic ground state.
1 amu = 1.660539040(20)×10−27 kg = 1.660539040(20)×10−24 g
so 3 amu = 4.98162×10−27 kg = 4.98162×10−24g.
Note that the electron associated with the atom contributes such a small amount of mass that it does not fall within the precision of the above numbers.
Wiki User
∙ 7y agomass = 3 amu
Anonymous
number 2
Anonymous
6
Add your answer:
Earn +20 pts
What are the sizes of a hydrogen atom carbon atom and oxygen atom?
H has a mass number of 1 (one proton, no neutrons), Carbon has a mass number of 12 (6 neutrons, 6 protons) and O has a mass number of 16 (8 neutrons and 8 protons).
Is Most of the mass in an atom is in electrons?
the mass of electrons is negligble the pe rcentage of an atom's mass comes from its protons and neutrons
Where is the most mass of an atom?
Almost all of the mass of an atom is in the nucleus. The nucleus is made up of protons and neutrons, with hydrogen-1 as the lone exception because its nucleus has only a proton in it. In other atoms, protons and neutrons are fused together to form that nucleus. The electrons are out in their electron cloud. And we mention the electron because it has only about 1/1836th the mass of a proton. See how it works? A fistful of electrons weigh almost nothing compared to a single proton. The neutron is slightly heavier than a proton, so when neutrons and protons are gathered in any atomic nucleus, it contains most all of the mass of that atom.
Which two particles make up most of the mass of a hydrogen-2 atom?
The two particles that make up most of the mass of a hydrogen-2 atom are the proton and neutron. The proton has a positive charge and is responsible for defining the element, while the neutron has no charge and helps stabilize the nucleus.
How many neutrons on the middle shell of hydrogen?
Hydrogen doesn't have any neutrons as it is the first element on the periodic table and has an atomic number of 1, signifying it has one proton and no neutrons.
What is a direct consequence of the number of protons and neutrons in an atom's nuceuls?
Number of proton = atom numberfor example:Hydrogen has 1 proton and its atom number is also 1Number of neutrons + number of protons = mass numberfor example:Hydrogen have 1 proton and and NO neutrons, so the mass number is 1Helium has 2 protons and and 2 neutrons, so the mass number is 4
Is the mass of a hydrogen atom different from the mass of an oxygen atom?
all atoms have different masses Mass of an atom is due to protons and neutrons present in an atom and number of proton is something that distinguish between atoms, therefore mass of hydrogen is different to the mass number of oxygen, hydrogen's mass is 1 as it has only 1 proton and no neutrons, and oxygen mass's is 16 as it has 8 protons and 8 neutrons.
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
What are the sizes of a hydrogen atom carbon atom and oxygen atom?
H has a mass number of 1 (one proton, no neutrons), Carbon has a mass number of 12 (6 neutrons, 6 protons) and O has a mass number of 16 (8 neutrons and 8 protons).
what makes nearly all of the atom's mass?
The nucleolus.
Electrons has very little mass compared with the?
Compared with an atom. Protons and neutrons make up the nucleus of an atom with electrons in energy levels round the outside. If a proton has a mass of 1, then a neutron has a mass of very nearly the same (1) but an electron has a mass of 1/1836 or nearly two thousandth the mass of a proton.
Is a proton the least mass?
In an atom, there are 3 types of particles: protons, neutrons and electrons.Theoretically, protons and neutrons weight 1 Atomic Mass Unit. An electron weights 1/1836 of an Atomic Mass Unit. Therefore, in an atom, electrons weigh the least.
How can there be 1 proton with a hydrogen atom with a mass?
Protons and electrons both have mass. Therefore a hydrogen atom that contains one or both will have mass. (It will, however, be less massive than a hydrogen atom that also has neutrons.)
An atom has an atomic mass of 101g and has 57 neutrons what is the atomic number?
To find the atomic number, subtract the number of neutrons from the atomic mass. Atomic number = Atomic mass - Number of neutrons Atomic number = 101 - 57 Atomic number = 44 Therefore, the atomic number of the atom is 44.
Is Most of the mass in an atom is in electrons?
the mass of electrons is negligble the pe rcentage of an atom's mass comes from its protons and neutrons
Where is the most mass of an atom?
Almost all of the mass of an atom is in the nucleus. The nucleus is made up of protons and neutrons, with hydrogen-1 as the lone exception because its nucleus has only a proton in it. In other atoms, protons and neutrons are fused together to form that nucleus. The electrons are out in their electron cloud. And we mention the electron because it has only about 1/1836th the mass of a proton. See how it works? A fistful of electrons weigh almost nothing compared to a single proton. The neutron is slightly heavier than a proton, so when neutrons and protons are gathered in any atomic nucleus, it contains most all of the mass of that atom.
As we know that 1amu not equal to mass of 1 proton then why protium is equal to 1amu?
The atomic mass unit (amu) is defined as 1/12 the mass of a carbon-12 atom. It is a unit of mass that is used to describe the masses of atoms and molecules. The mass of a proton is actually slightly less than the mass of a carbon-12 atom, so it is not equal to 1 amu. However, the mass of a protium atom (which is an atom that consists of a single proton and no neutrons) is very close to 1 amu. This is because the mass of the proton makes up most of the mass of a protium atom. Therefore, protium is often said to be "approximately equal" to 1 amu.
