Question
What is the atomic number of the element aluminium?
This question was previously asked in
RPF SI 2018 Question Paper PDF (10-Jan-2019) (Shift 1)
The correct answer is
13
The atomic number of an element equals the number of protons in the nucleus of its atom.
Aluminium (symbol Al) has 13 protons, with electronic configuration 2, 8, 3.
It belongs to group 13 and period 3 of the modern periodic table and is the most abundant metal in the Earth's crust.
Hence, 13.
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