Question
The atom of an element contains 2 electrons in its
M-shell. The element is:Solution
The electronic configuration of magnesium is 2,8,2. The M-shell (third shell) contains 2 electrons, which corresponds to magnesium (Mg, atomic number 12).
- Sodium (Na,2,8,1) has 1 electron in its M-shell.
- Aluminium (Al,2,8,3) has 3 electrons in its M-shell.
- Chlorine (Cl,2,8,7) has 7 electrons in its M-shell.
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