Understanding Valence and Core Electrons

This video tutorial explains how to calculate and understand valence electrons using examples of nitrogen, aluminum, and iodine. It covers the Bohr model, electron configuration, and periodic table methods to identify valence and core electrons. The video also highlights the importance of valence electrons in chemical reactions and provides efficient techniques for determining core electrons in larger atoms.

What is the atomic number of nitrogen?

• 21

• 14

• 7

• 5

How many valence electrons does an aluminum atom have?

• 8

• 5

• 3

• 2

Which electrons are primarily involved in chemical reactions?

• Neutrons

• Protons

• Valence electrons

• Core electrons

What is the electron configuration for nitrogen?

• 1s2 2s2 2p3

• 1s2 2s2 2p6

• 1s2 2s2 3p3

• 1s2 2p6 3s2

How many valence electrons does chlorine have?

• 8

• 6

• 5

• 7

Which group in the periodic table contains elements with one valence electron?

• Group 1

• Group 2

• Group 3

• Group 4

How many valence electrons do the chalcogens have?

• 5

• 7

• 6

• 4

What is the atomic number of iodine?

• 60

• 47

• 53

• 35

How many core electrons does iodine have?

• 46

• 47

• 53

• 60

Which method can be used to quickly find the number of core electrons in large atoms?

• Drawing Bohr model

• Using atomic and group numbers

• Writing full electron configuration

• Counting protons