Elements and Compounds
Atoms and Atomic Structure
Atomic Mass

# How do you find the number of neutrons in an atom given only the atomic number and the mass number?

91011 ###### 2016-03-01 11:11:10

Atomic number -> Number of protons

Mass number -> Number of protons and neutrons

So. if you substract atomic number from the mass number you get the number of neutrons.

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## Related Questions The mass number of the given atom is equivalent to the sum of the numbers of protons and neutrons. The atomic number of an atom equals to the number of protons in that atom. Therefore, the number of neutrons of an atom can be found by subtracting the atomic number from the mass number. The number of neutrons in an atom can affect the atomic mass of an 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. The number of neutrons in an atom affects the atomic mass number or atomic weight. The atomic number when subtracted from the atomic mass will give the number of neutrons in an atom. Atomic Mass - Atomic Number = Number of neutrons. Explanation: The atomic mass of any atom is the sum of protons and neutrons which are present in the nucleus of the atom. The atomic number of any atom gives the number of protons in the atom and also gives the number of electrons (Only if it is a neutral atom ,i.e., when it is not an ion). Thus, The number of neutrons can be calculated by subtracting the atomic number from the atomic mass. It is equal to the number of neutrons in the given atom. The atomic number is the same; the number of neutrons is different. 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. Atomic mass is equal to the number of protons + neutrons present in the nuclide. The atomic number is defined as the number of protons in the nuclide. Therefore to find the number of neutrons use the formula: atomic mass = #protons + # neutrons solving for # of neutrons you get: # neutrons = atomic mass - # protons plug in the given values: #neutrons = 31 - 15 # neutrons = 16 The number of neutrons is the mass number of the atom minus its atomic number. Neutrons, like protons are considered to have a mass of about 1. To find the number of neutrons, subtract the atomic number from the atomic mass. The number of electrons in an atom is always equal to the number of protons in that same atom. Since the atomic mass of a periodic element equals the weight of the atoms protons AND its neutrons, the following equation can be used to calculate the number of any given particle in an atom: number of neutrons = atomic mass - atomic number You subtract the atomic number from the atomic weight. For example, if you have a helium atom and its atomic weight is 4 and you subtract its atomic number (2) the number of neutrons in the helium atom is 2. Atomic mass minus atomic number. This is rather simplified but the atomic mass of an element is the total of all the protons, neutrons, and electrons in an atom. Each proton and neutron has an atomic mass of approximately 1 AMU (atomic mass units) while an electron has an atomic mass of about 0.0005 AMU. So, you don't need to worry about the electrons. The atomic number of an element is simply the number of protons in the atom. So, atomic mass (number of protons and neutrons) minus atomic number (number of protons) equals number of neutrons in an atom. To calculate the number of neutrons in an atom, subtract the atomic number from the atomic weight. That will give you the number of neutrons. The atomic number is the number of protons. The atomic weight consists of the number of protons plus the number of neutrons. (The electrons add very little to the atomic weight.)  The atomic number of a chemical element is equal to the number of electrons or protons. The number of neutrons = Atomic weight of an isotope (rounded) - atomic number of the element (or the number of protons) atomic number is how much protons(positive atom) and neutrons(neutral atom) are there in an element. therefore an atom does not have an atomic number The number of neutrons depends on the atom. In general, mass number = atomic number + number of neutrons. The number of neutrons determines the neutron number and the isotope of that atom. The number of neutrons is the atomic number - atomic mass. The number of protons is given to you-- it's the atomic number. The number of electrons always equals the number of protons. To calculate the number of neutrons, subtract the number of protons from the atomic mass number given. In a neuteral atom no. of electrons=no. of protons no. of protons=22 and atomic number is given by no. of protons=22 Hence Atomic number is 22 Atomic number is the number of protons in an atom. In a neutral atom the numbers of protons and electrons are equal. So if you know the atomic number of a neutral atom, you will also know the numbers of protons and electrons. Mass number is the sum of protons and neutrons in a particular isotope of an atom. Since atomic number is the number of protons in an atom, subtract the atomic number (or number of protons) from the mass number to get the number of neutrons. Mass no. - atomic no. = no. of neutrons or mass no. - no. of protons = no. of neutrons.  Atomic mass is simply the sum of the number of protons and the number of neutrons. If an atom has "A" protons and "B" neutrons, its atomic mass is A + B.

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