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Q.

What is the mass of aluminium?


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a

24 u   

b

26 u   

c

27 u   

d

30 u 

answer is C.

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Detailed Solution

        We are aware that aluminium has an atomic number of 13. Consequently, an aluminium atom has 13 electrons orbiting its nucleus.
        The atom remains electrically neutral because the amount of electrons and protons is constantly equal. Consequently, an aluminium atom's nucleus contains 13 protons.
        The aluminium atom's nucleus contains fourteen neutrons.
        Any element's atomic mass is calculated by adding its neutron count to its atomic number.
        Aluminum's atomic number times its mass plus The aluminium atom's neutron count
        Change the atomic number to 13 and the number of neutrons to 14. Consequently, Aluminium Mass = 13 + 14 = 27 u.
        Aluminium therefore has a mass of 27 u.
  
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