Question

Assertion:atomic mass of aluminum is 27 ,Reason:an atom of aluminum is 27 times heavier than 1/12th of the mass of the C-12 atom

Answer 1

Answer:

aluminium atomic mass is 27 because it has 13 electrons and 14 protons

we know ATOMIC MASS = number of electrons + number of proton

Answer 2

Answer:

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Atomic mass is the sum of number of protons and of neutrons.

Aluminum contains thirteen protons and fourteen neutrons in it.

So, it's atomic mass is .

i.e.

Atomic Mass of Aluminum = Number of protons + Number of neutrons

=> 13 + 14

=> 27 u

27 u is the Atomic Mass of Aluminum.

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