Valence Electrons and Electron Configuration

This video tutorial explains how to find the number of valence electrons for titanium, a transition metal. It begins with an overview of valence electrons in main group elements and highlights the challenges with transition metals. The video then focuses on the electron configuration of titanium, using condensed notation to simplify the process. By examining the electrons outside the noble gas core, the tutorial determines that titanium has four valence electrons. The video also discusses how titanium forms ions, such as Ti4+ and Ti3+, by losing electrons. The key takeaway is to use condensed electron configuration to identify valence electrons in transition metals.

What is the main challenge in finding the number of valence electrons for transition metals like titanium?

• They are not listed in the periodic table.

• They have more than one valence shell.

• Their valence electrons are not in the outermost shell.

• They have a complex electron configuration.

How many valence electrons do elements in group 1 of the periodic table have?

• Three

• Two

• Four

• One

Which group of elements is skipped when counting valence electrons in the periodic table?

• Transition metals

• Alkali metals

• Halogens

• Noble gases

What is the noble gas used in the condensed electron configuration of titanium?

• Xenon

• Argon

• Krypton

• Neon

What is the condensed electron configuration notation for titanium?

• [Ne] 3s2 3p6 3d2 4s2

• [Ar] 3d2 4s2

• [Kr] 4d2 5s2

• [Xe] 4f14 5d2 6s2

How many valence electrons does titanium have?

• Four

• Five

• Three

• Two

What happens to titanium's electron configuration when it forms a Ti4+ ion?

• It gains two electrons.

• It loses two electrons.

• It loses four electrons.

• It gains four electrons.

When titanium forms a Ti3+ ion, how many electrons does it lose?

• Three

• One

• Two

• Four

What is the key to finding the number of valence electrons in titanium?

• Writing the condensed electron configuration

• Using the periodic table

• Counting all electrons

• Observing its physical properties

What is the electron configuration outside the noble gas core for titanium?

• 3d2 4s2

• 4d2 5s2

• 4f14 5d2

• 3p6 4s2