Atomic Structure and Electron Configuration

Mr. LeBlanc introduces valence electrons and Lewis dot diagrams, recaps atomic structure, and explains electron shells and noble gases. He discusses valence electrons' role in stability and introduces Bohr models and Lewis dot diagrams, demonstrating how to draw them for various elements and compounds.

What is the charge of a neutron?

• Positive

• Neutral

• Negative

• Variable

Which electron shell can hold a maximum of two electrons?

• First shell

• Second shell

• Third shell

• Fourth shell

Why are noble gases generally unreactive?

• They have no neutrons

• They have full valence shells

• They are metals

• They lack protons

What happens to an atom when it loses an electron?

• It becomes negatively charged

• It remains neutral

• It becomes positively charged

• It becomes a noble gas

In a Bohr model, what does the central circle represent?

• Electron shell

• Proton

• Nucleus

• Valence shell

How many electrons are in the second shell of a sodium atom in its Bohr model?

• 2

• 11

• 8

• 10

What is the main purpose of a Lewis dot diagram?

• To measure atomic mass

• To show the nucleus

• To display valence electrons

• To count protons

How many valence electrons does chlorine have?

• 5

• 6

• 7

• 8

In a Lewis dot diagram, what does a dash represent?

• A single electron

• A pair of shared electrons

• A proton

• A neutron

What is the electron configuration for carbon in a Lewis dot diagram?

• C with 2 dots

• C with 4 dots

• C with 6 dots

• C with 8 dots