![]() However, a point to be noted here is that in any shell containing more than 2 electrons (i.e. Thus, 8 electrons can be accommodated in the L shell of the sodium atom. Maximum number of electrons in L shell of sodium atom = 2n 2 = 2 (2) 2 = 8 ![]() Now, we will calculate the number of electrons for the second shell i.e. After adding the K shell to the nucleus of the sodium atom, it can be drawn as follows: Thus, 2 electrons can be accommodated in the K shell. Maximum number of electrons in K shell of sodium atom = 2n 2 = 2 (1) 2 = 2 Now, calculating the number of electrons for the first shell i.e. Maximum number of electrons in a shell = 2n 2 The maximum number of electrons that are allowed in any particular shell is given by the following formula: Now, we have to accommodate these electrons around the nucleus. This indicates that in a sodium atom 11 electrons revolve around the nucleus. Therefore, for sodium atom, Number of electrons = Atomic number = 11 The number of electrons is also equal to the atomic number of atoms. Moving forward, we will now calculate the number of electrons in the sodium atom. In the above figure, p + and n° symbolize positively charged protons and neutral neutrons, respectively. Number of neutrons in sodium atom = 23 – 11 = 12Īs the nucleus of an atom is composed of neutrons and protons we can draw the nucleus of the sodium atom using the above findings. Now, calculate the number of neutrons by using the above formula: Therefore, the atomic mass of sodium can be taken as 23. Now, round up this figure to get the nearest whole number. The atomic mass of sodium, as mentioned in the sodium box given above is 22.989. Number of neutrons = Atomic mass (rounding it up to the nearest whole number) – Number of protons The formula for finding the number of neutrons in an atom is given as follows: Now, we shall calculate the number of neutrons present in the nucleus of the sodium atom. Hence, for the sodium atom, Number of protons = Atomic number =11 In the case of the sodium atom, the atomic number is 11. The number of protons is always equal to the atomic number of an atom. To draw the Bohr model of sodium we must first find out the number of all the atomic particles present in the sodium atom.įirst, let us determine the number of protons in the sodium atom.
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