Understanding Electron Configurations

Why is the Bohr model not effective for elements beyond the 18th?

• It cannot represent isotopes.

• It becomes too complex and bulky.

• It only works for noble gases.

• It does not account for electron spin.

What shape are the S orbitals, and how many electrons can they hold?

• Dumbbell-shaped, holding 6 electrons

• Spherical, holding 6 electrons

• Spherical, holding 2 electrons

• Dumbbell-shaped, holding 2 electrons

Which block on the periodic table can hold up to 10 electrons?

• S block

• F block

• D block

• P block

What is the electron configuration for lithium?

• 1s2 2s1

• 1s2 2p1

• 1s2 2s2

• 1s1 2s2

How many electrons are in the second shell of nitrogen?

• 7

• 5

• 3

• 2

What is the electron configuration for aluminum?

• 1s2 2s2 2p6 3s2 3p1

• 1s2 2s2 2p6 3s1 3p2

• 1s2 2s2 2p6 3s2 3p2

• 1s2 2s2 2p6 3s1 3p1

Which element's electron configuration ends with 3p5?

• Aluminum

• Calcium

• Sulfur

• Chlorine

What is the electron configuration for sulfur?

• 1s2 2s2 2p6 3s2 3p3

• 1s2 2s2 2p6 3s1 3p4

• 1s2 2s2 2p6 3s2 3p5

• 1s2 2s2 2p6 3s2 3p4

Which element's electron configuration ends with 3d6?

• Sulfur

• Germanium

• Krypton

• Iron

What is the purpose of noble gas notation in electron configurations?

• To highlight valence electrons

• To simplify and shorten configurations

• To represent isotopes

• To show electron spin