Question

Calculate l and s of magnesium using atomic number

Answer 1

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Relative Atomic Mass (R.A.M.) of Magnesium can be easily looked up in any Dimithri Mendelev Periodic Table. The rounded up value is 24. The exact value to the 5th significant figure is 24.305.

To calculate the R.A.M. of Magnesium, abundance is needed. So, let's say that for every atom of Mg-24 there is one atom of Mg-25.

Now, the relative atomic mass of an element can be found by using the atomic masses of its isotopes and their respective abundance

Ar=∑i(isotopei×abundancei)

In your case, magnesium-24 will have an atomic mass of 24u.

because it contains 12 protons and 12 neutrons. Here u represents the unified atomic mass unit and is equal to the mass of one nucleon (proton or neutron).

Likewise, magnesium-25 will have an atomic mass of 25u because it contains 12 protonsaqnd 13 neutrons.

This means that the relative atomic mass of magnesium will be

Ar=24 u×50100+25 u⋅50100=12×49 u=24.5 u

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