The element in question is Sodium
An atomic mass unit is defined as 1/12 th of the mass of carbon-12 atom.
The mass of an atom is mainly due to its protons and neutrons in the nucleus.
Weight of a proton is 1.6 x 10^-27 kg
Weight of a neutron is 1.6 x 10^-27kg
However weight of an electron is 9 x 10^-31kg and hence is negligible in calculation of amu
It is given that weight is 23 AMU and number of protons is 11
The protons in a nucleus also act as atomic number of the periodic table
Proton number 11 is the atomic number of Sodium
Hence the element is Sodium
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