Electron Configurations and Excited States in Atoms

The video tutorial explains the concept of excited states in electron configurations, contrasting them with ground states. It uses sodium and magnesium as examples to illustrate how electrons can move to higher energy orbitals when energy is added, such as through light or electricity. The tutorial emphasizes that excited states differ from ions, as electrons do not leave the atom but shift to higher energy levels. This understanding is crucial for answering questions related to excited states in chemistry.

What is the primary difference between a ground state and an excited state of an atom?

• Ground state has more energy than excited state.

• Excited state has more energy than ground state.

• Excited state is more stable than ground state.

• Ground state and excited state have the same energy.

Which element is used as an example to explain the concept of excited states?

• Helium

• Sodium

• Oxygen

• Carbon

What is the ground state electron configuration of sodium?

• Neon core with two electrons in 3p orbital

• Neon core with two electrons in 3s orbital

• Neon core with one electron in 3p orbital

• Neon core with one electron in 3s orbital

How can an electron be moved to a higher energy orbital?

• By removing energy from the atom

• By adding energy through light or electricity

• By applying pressure

• By cooling the atom

What does the notation 'neon 3p1' signify in the context of sodium's excited state?

• A sodium atom with a lost electron

• An excited state sodium atom

• A ground state sodium atom

• A sodium ion

What is a key characteristic of an excited state?

• The atom becomes an ion

• Electrons move to lower energy orbitals

• At least one electron moves to a higher orbital

• All electrons move to higher orbitals

In the context of excited states, what is the significance of the 'star' notation?

• Indicates a neutral atom

• Indicates an excited state atom

• Indicates an ionized atom

• Indicates a ground state atom

What happens to one of the electrons in magnesium's excited state?

• It leaves the atom

• It moves to the 4s orbital

• It moves to the 3p orbital

• It stays in the 3s orbital

How does an excited state differ from an ion?

• In an ion, electrons stay in their original orbitals.

• In an excited state, electrons are removed from the atom.

• In an ion, electrons move to higher orbitals.

• In an excited state, electrons move to higher orbitals without leaving the atom.

Which orbital does an electron in magnesium move to in its first excited state?

• 4s orbital

• 3p orbital

• 2p orbital

• 3s orbital