Shell Model

What does the electron configuration of an atom represent?

• The number of electrons in the atom

• The arrangement of electrons in energy levels and sublevels

• The atomic mass of the atom

• The number of protons in the atom

According to the shell model of the atom, which electrons are closer to the nucleus?

• Electrons in higher energy levels

• Electrons in lower energy levels

• Electrons in the same energy level

• All electrons are equidistant from the nucleus

In the electron configuration 2p⁴, how many unpaired electrons are there?

• 0

• 1

• 2

• 3

What is the electron configuration of a neutral magnesium atom (Mg, atomic number 12)?

• 2s² 2p²

• 3s²

• 3s² 3p²

• 3s² 3p⁶

What is the electron configuration for carbon (C, atomic number 6)?

• 2s² 2p²

• 2s² 2p³

• 2s² 2p⁴

• 3p²

Which of the following orbitals has a dumbbell shape?

• s

• p

• d

• f

Which orbital can hold a maximum of 2 electrons with opposite spins?

• s orbital

• p orbital

• d orbital

• f orbital

In the electron configuration 3p³, how many electrons are in the 3p orbital?

• 1

• 2

• 3

• 4

How many orbitals are there in the p sublevel?

• 1

• 2

• 3

• 6

What is the electron configuration of calcium (Ca, atomic number 20)?

• 4s²

• 4s¹

• 3s² 3p⁶ 4s¹

• 3p⁶ 4s¹