Q.

Aluminium has an atomic mass of __.

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a

17

b

36

c

16

d

27

answer is A.

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Detailed Solution

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Aluminium has an atomic mass of 27. 
Aluminium has 13 protons and 13 electrons, 14 neutrons
Atomic mass=sum of the number of protons and a number of neutrons.

                        =13+14 =27u

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