54. Solving a chemistry problem

2. Write the electronic graphic formula of the atom of the element with the indicated serial number (see the number of the variant). Indicate the type of element (s-, p-, d-, f-), does it belong to metals or non-metals? Indicate the valence electrons of the atom of this element. What are its valence possibilities? If excited states are possible for a given atom, then write them down using electronic formulas. If not possible, explain why. How many unpaired electrons are there in an atom in the ground state and how many in excited states? How many vacant orbitals are there in an atom in the ground and excited states? Determine the highest and lowest oxidation states of an atom of a given element. What properties - oxidizing, reducing, or both - will an atom exhibit in higher, lower, and other oxidation states? How do the properties of atoms of a given element change in comparison with neighboring elements in the period?
2.3. No. 12 Mg