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Which of the following options represents the number of neutrons present in aluminium?
13
14
15
27
14
The number of neutrons in an atom is calculated by subtracting the atomic number (number of protons) from the mass number. Aluminium (Al) has an atomic number of Z=13 and a mass number of A=27.
The number of neutrons in an atom is calculated by subtracting the atomic number (number of protons) from the mass number. Aluminium (Al) has an atomic number of Z=13 and a mass number of A=27.
Think of the total weight of a fruit basket as the mass number. If the total number of fruits is the mass, and you know how many are apples (protons), the remaining fruits must be oranges (neutrons).
A - Z = N (Atomic mass minus protons equals neutrons).
A=Z+N тАФ The relationship between mass number (A), atomic number (Z), and neutrons (N)
N=AтИТZ тАФ The calculation for determining the number of neutrons
An atom is composed of protons, neutrons, and electrons. The mass number A represents the total count of nucleons (protons + neutrons). By using the formula N=AтИТZ, where N is the number of neutrons, A is the mass number, and Z is the atomic number, we can determine the neutron count. For Aluminium-27: N=27тИТ13=14.
Atomic number (Z) for Aluminium is 13.
Atomic mass number (A) for the most common isotope of Aluminium is 27.
Neutrons do not carry an electric charge.
Nuclear stability analysis
Identification of isotopes
Aluminium is in Group 13 of the periodic table.
Option A (13) represents the atomic number (protons). Option C (15) and D (27) are incorrect; 27 is the mass number itself.
B is correct тАФ Subtracting the atomic number (13) from the mass number (27) gives 14 neutrons.
Always remember that the mass number given in questions about isotopes usually refers to the most abundant stable isotope; for Aluminium, it is always 27.
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