Electron Configuration of Magnesium

The video tutorial explains how to determine the electron configuration for magnesium. It starts by identifying the number of electrons using the atomic number from the periodic table. The tutorial then guides through writing the electron configuration using orbital notation, filling the 1s, 2s, 2p, and 3s orbitals with the appropriate number of electrons. The final configuration for magnesium is 1s² 2s² 2p⁶ 3s².

What information does the atomic number of magnesium provide?

• Number of valence electrons

• Number of neutrons

• Number of protons and electrons

• Number of isotopes

What is the first step in writing the electron configuration for magnesium?

• Identifying the number of neutrons

• Determining the number of electrons

• Locating the element in the periodic table

• Finding the atomic mass

Which orbital is filled first when writing the electron configuration for magnesium?

• 3s

• 2p

• 1s

• 2s

How many electrons can the 1s orbital hold?

• Eight

• Six

• Two

• Four

How many electrons are placed in the 2p orbital for magnesium?

• Eight

• Six

• Four

• Two

What is the total number of electrons used after filling the 1s, 2s, and 2p orbitals?

• Fourteen

• Twelve

• Ten

• Eight

What is the complete electron configuration for magnesium?

• 1s2 2s2 2p6 3d2

• 1s2 2s2 2p4 3s2

• 1s2 2s2 2p6 3s2

• 1s2 2s2 2p6 3p2