Valence Electrons and Atomic Structure in Nitrogen and Aluminum

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

What is the atomic number of nitrogen, and how many valence electrons does it have?

• 14, with 5 valence electrons

• 7, with 5 valence electrons

• 14, with 7 valence electrons

• 7, with 7 valence electrons

In the Bohr model of nitrogen, how many electrons are in the first energy level?

• Two

• Eight

• Seven

• Five

How many valence electrons does aluminum have?

• Two

• Eight

• Five

• Three

What is the total number of core electrons in an aluminum atom?

• Thirteen

• Three

• Ten

• Eight

Which energy level contains the valence electrons for nitrogen?

• Third

• Second

• First

• Fourth

What is the electron configuration for chlorine?

• 1s2 2s2 2p6 3s2 3p3

• 1s2 2s2 2p6 3s2 3p4

• 1s2 2s2 2p6 3s2 3p5

• 1s2 2s2 2p6 3s2 3p6

Which group in the periodic table contains elements with three valence electrons?

• Group 1

• Group 13

• Group 17

• Group 2

How many valence electrons do halogens typically have?

• One

• Two

• Seven

• Six

What is the efficient method to find the number of core electrons in iodine?

• Subtract the atomic number from the valence electrons

• Subtract the valence electrons from the atomic number

• Add the atomic number and valence electrons

• Multiply the atomic number by the valence electrons

How many core electrons does iodine have if it has 53 total electrons and 7 valence electrons?

• 46

• 53

• 60

• 7