What is the Atomic Mass of Aluminium?
Atomic Mass of Aluminium is .
A) 26
B) 25
C) 27
D) 28
Answer: The atomic mass of Aluminium is 27 amu. Therefore, the correct option is C.
Explanation:
Atomic Mass of any substance is the sum of the number of protons and the number of neutrons in the nucleus of that atom.
For Aluminium,
- Number of Protons = 13
- Number of Neutrons = 14
Thus,
Atomic Mass of Aluminium = 13 + 14 = 27
In absolute terms, the average atomic mass of aluminium is 26.981 amu. It is calculated taking into account all the isotopes of Aluminium.
Aluminium has 9 isotopes and the two main Isotopes of Aluminium are:
- 26Al
- 27Al (Stable)