Electron Configuration

Multiple Choice

Why is understanding electron configuration important in chemistry?

• It helps predict chemical properties and reactivity of elements.

• It determines the color of an element.

• It explains the physical state of an element at room temperature.

• It tells us the atomic mass of an element.

Fill in the Blank

Within energy shells, orbitals can have different shapes and contain different total numbers of ___.

Multiple Choice

Which energy level around an atom has the most energy?

• E1

• E2

• E3

• E4

Multiple Choice

Which of the following orbital types can hold the greatest number of electrons?

• s orbital

• p orbital

• d orbital

• f orbital

Multiple Select

Select all correct statements about s and p orbitals based on their appearance and arrangement in atoms.

• s orbitals are spherical in shape

• p orbitals are dumbbell-shaped

• s and p orbitals can overlap in space

• p orbitals are always closer to the nucleus than s orbitals

Fill in the Blank

The quantum number n=2 refers to the ___ energy level.

Multiple Select

Which of the following statements are true about orbitals?

• Each orbital can hold a maximum of 2 electrons.

• Orbitals are referred to using quantum numbers.

• Orbitals are the same as energy levels.

• Orbitals are represented as boxes in diagrams.

Open Ended

Explain the analogy between the structure of a house and the organization of electron configuration in atoms.

Multiple Choice

How many electrons can the 3d sublevel hold?

• 2

• 6

• 10

• 14

Multiple Choice

Which of the following sublevels are present in the 4th energy level?

• 4s, 4p, 4d, 4f

• 4s, 4p, 4d

• 4s, 4p

• 4s, 4d, 4f

Open Ended

Explain how the order of filling electron sublevels is determined according to the diagrams shown.

Fill in the Blank

The d block in the periodic table is always ___ energy level(s) behind the period number.

Multiple Choice

What is the maximum number of electrons that can occupy the p sublevel?

• 2

• 6

• 10

• 14

Multiple Choice

Which sublevel can hold a maximum of 14 electrons?

• s

• p

• d

• f

Open Ended

How does the arrangement of elements in the periodic table relate to their electron configuration?

Multiple Choice

Which of the following elements has the electron configuration 1s2 2s2 2p6 3s2?

• Mg

• Se

• Cr

• Na

Multiple Choice

Which of the following is the correct electron configuration for Selenium (Se)?

• 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p4

• 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p2

• 1s2 2s2 2p6 3s2 3p6 4s2 3d8 4p6

• 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6

Multiple Select

Select all statements that are true about valence electrons based on the lesson.

• Valence electrons are located in the outermost shell.

• Valence electrons can be transferred or shared with another atom.

• All electrons in an atom are valence electrons.

• Valence electrons determine the chemical properties of an atom.

Fill in the Blank

The valence electron is responsible for the chemical ___ of the atom.

Open Ended

Explain the relationship between electron configuration and the number of valence electrons for main group elements.

Open Ended

How does the group number in the periodic table help determine the number of valence electrons for an element?

Open Ended

Reflecting on what you learned about electron arrangement in atoms, what is one concept or idea that you found most surprising or interesting?