Electrons in the ecited state

Excited Electrons

How do Atoms Release Colored Light. (Where does this color come from?)

When an electron in an atom gains a specific amount of energy, the electron is at a higher energy state (excited state).

​

​Excited State

To absorb means "to take in" When an atom is heated, the electron ABSORBS the energy and moves to a higher energy level (This is the excited state)

​

When is energy absorbed?

NOTES

When an electron returns from a higher energy state to a lower energy state, a specific amount of energy is emitted. This emitted energy can be used to identify an element.

​

A Release of Energy

To EMIT means "release"

Energy is emitted or released when an electron moves from a higher lenergy level to a lower energy level

​

How energy is emitted?

NOTES

Energy "absorbed" - move from low to high
Energy "released" or "emitted" = move from high to low

Multiple Choice

When a ground state electron in an atom moves to an excited state, the electron

• (1) absorbs energy as it moves to a higher energy state

• (2) absorbs energy as it moves to a lower energy state

• (3) releases energy as it moves to a higher energy state

• (4) releases energy as it moves to a lower energy state

Multiple Choice

An excited potassium atom emits a specific amount of energy when one of its electrons moves from

• (1) the fi rst shell to the fourth shell

• (2) the second shell to the fourth shell

• (3) the fourth shell to the fi fth shell

• (4) the fourth shell to the second shell

Multiple Choice

A specific amount of energy is emitted when excited electrons in an atom in a sample of an element return to the ground state. This emitted energy can be used to determine the

• Mass of the element

• The volume of the element

• The identity of the element

• the density of the element.

Multiple Choice

Which electron transition in an excited atom results in a release of energy?

• (1) first shell to the third shell

• (2) second shell to the fourth shell

• (3) third shell to the fourth shell

• (4) fourth shell to the second shell

Multiple Choice

Which change occurs when an atom in an excited state returns to the ground state?

• (1) Energy is emitted.

• (2) Energy is absorbed.

• (3) The number of electrons decreases.

• (4) The number of electrons increases.

Ground state vs excited state electrom configuration

Ground state Electron configurations are found on the periodic table

Excited State Electron Configuration
2-8-7-3

How can you tell if the configuration is ground or excited state?

Replace this with a header

1. Add up total # of electrons in the configuration

2. Determine the element by its atomic number
   a. If it matches ethe lement configuration on periodic table, this is Ground state
   b. If it doesnot match the element on the periodic table, it it excited state.

Identify the electron configuration as being ground state or excited state: 2-6-1

Example

Multiple Choice

Which electron configuration represents the electrons of a phosphorus atom in an excited state?

• (1) 2-8-5

• (2) 2-8-6

• (3) 2-7-6

• (4) 2-7-4

Multiple Choice

A bromine atom in an excited state could have an electron configuration of

• (1) 2-8-18-6

• (2) 2-8-18-7

• (3) 2-8-17-7

• (4) 2-8-17-8

Multiple Choice

Which electron configuration represents the electrons of a sulfur atom in an excited state?

• (1) 2-6-6

• (2) 2-7-7

• (3) 2-8-4

• (4) 2-8-6