![]() Now, finding the number of neutrons by applying the formula: Looking at the Lithium box that we drew above, we can say that the atomic mass of the Lithium atom is 6.938.Īfter rounding it up to the nearest whole number we get 7.Īlso, as calculated above, the number of protons in the Lithium atom is 3. Number of neutrons = Atomic mass (rounding it up to the nearest whole number) – Number of protons The following formula can be used for calculating the number of neutrons in an atom Therefore, for the Lithium atom, the number of protons = atomic number = 3įurther, we will calculate the number of neutrons present in the Lithium atom. In the case of the Lithium atom, the atomic number is 3. The number of protons for any atom is always equal to the atomic number of that atom. Let us begin by drawing the nucleus for the Lithium atom, for which we will have to calculate the number of protons and neutrons in the Lithium atom.įirst, we will calculate the number of protons Now, we can draw the Bohr model of the Lithium atom with the help of this information.
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