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The atomic number refers to the number of protons in the nucleus. This is what dictates the atom's chemical properties. One proton, hydrogen. Two protons, helium, and so on. The mass number is the sum of protons and neutrons combined.

Therefore, the number of neutrons in an atom of samarium (62 Sm 151) is the difference: 89 Samarium 151 is not stable, incidentally. It has a half life of 90 years, decaying by beta particle emission. What happens (essentially) is that one of those neutrons splits into a proton/electron pair. The electron is ejected from the nucleus. The atomic number goes up by one, but the mass remains the same. 62 Sm 151 transmutes into 63 Eu 151 (europium), which is a stable rare earth element.

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How do you find the number of neutrons from the mass number?

Atomic mass is the number of protons in an atom mass number is the number of protons plus neutrons in an atom the number of neutrons would equal the mass number minus the atomic number.


How do you tell how many neutrons are in an atom with the atomic number of 12?

To find the number of neutrons in an atom with an atomic number of 12 (which is the number of protons), you would subtract the atomic number from the atomic mass number. The atomic mass number is the sum of the protons and neutrons in the atom. For an atom with an atomic number of 12, the number of neutrons can be calculated by subtracting 12 from the atomic mass number given for that specific atom.


How many protons neutrons and electrons are present in and surrounding the nucleus of a coloring atom?

The number of protons in the nucleus of an atom determine its atomic number, while the number of neutrons and electrons can vary based on the specific isotope. In a neutral atom, the number of electrons is equal to the number of protons. The number of neutrons can be calculated by subtracting the atomic number from the atomic mass.


How can you determine the number of neutrons in an atom if its mass number and its atomic number are known?

It is impossible to determine the number of neutrons from the mass number and atomic mass, since the two are essentially same value. However, with the atomic number and the mass number, one can calculate the number of neutrons by subtracting the atomic number from the mass number.


Which particles account for the difference between the atomic number and the mass number?

The answer is that it is neutrons that account for the difference between atomic weight and atomic number. The atomic number is the number of protons or the number of electrons in the atom, since they are normally equal. The atomic weightis the sum of the total number of protons, electrons AND neutrons in the atom. Knowing both the atomic number and the atomic weight of an atom lets you know the number of neutrons in the atom (the isotope). Example: Uranium, Atomic Number 92, Atomic Weight 235. The atomic number tell you that the uranium atom has 92 protons and 92 electrons. The atomic weight tells you that it has a combined total of 235 protons, electrons and neutrons. Since you know from the atomic number that there is a total of 184 protons and electrons in the atom (92 + 92) and from the atomic weight that the total number of protons, electons and neutrons is 235 (92 + 92 + X = 235), you now know that there are 151 neutrons in that uranium atom. The atomic number and atomic weight together tell you that the uranium atom 235 has 92 protons, 92 electons and 151 neutrons.

Related Questions

The number of neutrons in an atom can be found by subtracting the atomic number from the?

Atomic weight in atomic mass units = the number of protons + the number of neutrons. The number of protons is your atomic number. Subtract that from the atomic weight for the number of neutrons.


What is atomic mass A and neutron number N for given atom?

Atomic mass is the number of protons and neutrons that make up an atom. The neutron number is only the number of neutrons present in the atom. This can be found by subtracting the number of protons from the atomic mass.


What are the particles that make a atom including the atomic number and mass number?

The atomic number is the number of protons in an atom (which equal the number of electrons present) The atomic mass is the number of protons+neutrons in an atom


What is the number of neutrons in an atom affects the atomic what?

The number of neutrons in an atom can affect the atomic mass of an atom.


The diffirentiate of atomic mass and atomic number?

Atomic mass is defined as the sum of the no. of proton and neutron present in the nucleus of an atom and Atomic Number is defined as the no. of electrons present in the extra nuclear part of an atom . BY; SHUBHAM KAKKAR


Subtracting the Atomic number from the atomic mass?

To find the number of neutrons in an atom, you would subtract the atomic number (number of protons) from the atomic mass (sum of protons and neutrons). The difference between the atomic mass and the atomic number gives you the number of neutrons in the atom.


How do you find the number of neutrons from the mass number?

Atomic mass is the number of protons in an atom mass number is the number of protons plus neutrons in an atom the number of neutrons would equal the mass number minus the atomic number.


What do you have when you subtract the atomic no from atomic mass?

Atomic number is number of protons in an atom while atomic mass is the sum of protons and neutrons in an atom when you subtract you will get the number of neutrons in an atom.


How do you tell how many neutrons are in an atom with the atomic number of 12?

To find the number of neutrons in an atom with an atomic number of 12 (which is the number of protons), you would subtract the atomic number from the atomic mass number. The atomic mass number is the sum of the protons and neutrons in the atom. For an atom with an atomic number of 12, the number of neutrons can be calculated by subtracting 12 from the atomic mass number given for that specific atom.


How many protons neutrons and electrons are present in and surrounding the nucleus of a coloring atom?

The number of protons in the nucleus of an atom determine its atomic number, while the number of neutrons and electrons can vary based on the specific isotope. In a neutral atom, the number of electrons is equal to the number of protons. The number of neutrons can be calculated by subtracting the atomic number from the atomic mass.


Atomic mass is the number of what in the nucleus?

Atomic mass is the sum of protons and neutrons that are present in the nucleus While the number of protons and electrons remain constant in the neutral atom, the number of neutrons may vary within different atom species of the same element. As a result, the atomic mass for one atom may be different from another atom of the same element if the number of neutrons varies.


How many neutrons are in one atom?

The number of neutrons in one atom can vary depending on the element. Neutrons are one of the three main subatomic particles found in an atom, along with protons and electrons. The number of neutrons in an atom is calculated by subtracting the number of protons (atomic number) from the atomic mass of the atom.