essential for many biological processes – Discussion Forum

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Virat

Asked: September 11, 2026In: Class 9 Science

Magnesium is essential for many biological processes, including muscle contraction. For an atom of magnesium with a mass number of 24 and atomic number 12, determine the number of (i) protons, (ii) neutrons, (iii) electrons and also illustrate the arrangement of electrons in a magnesium atom.

Magnesium contains 12 protons, 12 neutrons and 12 electrons. The 12 electrons are distributed across shells in the electronic configuration 2, 8, 2, placing two in K-shell, eight in L-shell and two in M-shell.