Finding Shells and Valence Electrons on the Periodic Table

The video tutorial explains how to find shells and valence electrons using the periodic table. It covers the concepts of periods, groups, and atomic numbers, and how they relate to electron orbitals and valence electrons. The tutorial also discusses the reactivity trends of elements based on their valence electrons and electron shells, using examples like potassium, calcium, and sodium. The video provides a method to renumber the periodic table to easily identify valence electrons in different groups.

What is each row in the periodic table called?

• Series

• Block

• Period

• Group

How many electron orbitals does potassium have?

• Two

• Three

• Four

• Five

What do elements in the same group have in common regarding their electron configuration?

• Same number of protons

• Same atomic mass

• Same number of valence electrons

• Same number of neutrons

How many valence electrons does calcium have?

• Two

• Six

• Eight

• Four

What does the atomic number of an element represent?

• Total number of orbitals

• Number of valence electrons

• Number of neutrons

• Total number of electrons or protons

How are the groups renumbered to find valence electrons?

• 1 to 8 including all groups

• 1 to 10 including transition metals

• 1 to 18 without skipping

• 1 to 8 skipping middle groups

What is the valence electron count for an element in group 8?

• Eight

• Two

• Four

• Six

Which direction does reactivity increase in a period?

• Bottom to top

• Top to bottom

• Right to left

• Left to right

What causes an element to be highly reactive?

• Many valence electrons

• High atomic number

• Many electron shells

• Few valence electrons

Why is sodium considered a very reactive metal?

• It is a noble gas

• It has a single valence electron

• It has a high atomic number

• It has many electron shells