Understanding Magnesium's Electron Configuration

The video explains how to determine the number of valence electrons in a magnesium atom. It presents two methods: using the periodic table and examining the electron configuration. Magnesium, located in group two of the periodic table, has two valence electrons. The electron configuration method confirms this by showing that the highest energy level, the third, contains two electrons. The video concludes by reiterating the findings.

What is the main focus of the video?

• The number of valence electrons in magnesium

• The number of protons in magnesium

• The chemical reactions of magnesium

• The atomic mass of magnesium

Which group is magnesium in on the periodic table?

• Group 1

• Group 4

• Group 2

• Group 3

How many valence electrons does magnesium have according to the periodic table?

• One

• Two

• Three

• Four

What is the atomic number of magnesium?

• 11

• 13

• 10

• 12

How many total electrons does a neutral magnesium atom have?

• 13

• 12

• 11

• 10

What is the electron configuration of magnesium up to the 3s level?

• 1s2 2s2 2p6 3s1

• 1s2 2s2 2p6 3p1

• 1s2 2s2 2p6 3p2

• 1s2 2s2 2p6 3s2

Which energy level contains the valence electrons for magnesium?

• First

• Fourth

• Second

• Third

What is the significance of the third energy level in magnesium?

• It is the innermost shell

• It contains no electrons

• It is the heaviest shell

• It contains the valence electrons