5.5 Atomic Emission Spectra
What happens when an atom that is in its ground state is supplied with energy?
Electron(s) move from lower energy levels to higher energy levels.
_____ spectrum is formed when atoms or molecules are de-excited from higher energy level to lower energy level.
Emission
If an electron jumps from a higher energy level to a lower energy level, energy will be...
Emitted
The emitted light corresponds to...
Energies of the specific electrons
When an electron in an atom moves from high to low energy levels:
Energy is emitted as electromagnetic radiation
When an electron is in the ____ state, it has a higher potential energy than it does in the ground state.
Excited
Atomic emission spectra are produced when...
Excited electrons return to ground state
The state of the atom in which one or more electrons occupy a higher energy level is called the ____.
Excited state
Absorption spectra are produced when an excited electron returns back to its ground state.
FALSE
The emission spectrum of a chemical element is the pattern of wavelengths obtained when the element is subjected to a specific excitation.
FALSE
The ground state of an atom, has the higher energy state.
FALSE
We cannot identify elements by using their emission spectrum.
FALSE
Line spectrum is also known as the absorption spectrum.
FALSE (atomic emission spectrum)
What happens when an electron jumps from a higher energy level to a lower energy level?
It emits a specific wavelength distinct to that element
In an electric discharge, the emission spectra of helium is an example of _____.
Line spectra
An atomic emission spectra consists of _____.
Lines of different frequencies
A body, upon heating, becomes red first, then yellow, and then other colors. Why?
Red light has the lowest frequency
An atom is said to be in an excited state when it possesses more energy than when it is in its ground state.
TRUE
An emission line spectrum is produced by low-density hot gases.
TRUE
Each element produces a unique atomic emission spectrum.
TRUE
Emission lines are seen when electrons return to the ground state, releasing light.
TRUE
Energy is absorbed when an electron jumps from a lower energy level to a high energy level.
TRUE
Light is emitted by an electron when it loses energy and returns to the ground state.
TRUE
The energy released when an electron jumps from the excited state to the ground state is equal to the difference between the two levels.
TRUE
Which statement correctly describes the energy that is absorbed by an atom?
The energy that can be absorbed by an atom is quantized
What is ground state of an atom?
The lowest energy state of the atom
What is an atomic emission spectra?
The pattern of lines formed when light passes through a prism to separate it into the different frequencies of light it contains
What would an atomic emission spectrum look like if the electron's energy levels in an atom were NOT quantized?
The spectrum would be continuous
Which of the following is not true?
There is only one type of energy transition in molecules which are electronic
What is a continuous spectrum?
Where all wavelengths and frequencies are represented (rainbow)
When light released (emission) as a result of electrons falling back down to the ground state is viewed through a spectroscope (prism), the result is called a(n)...
Atomic emission spectrum
Hydrogen's spectrum consists of ____ lines of visible light.
4
In the emission spectrum of helium, which has 2 electrons, we see _____.
5 colors
What is an excited state of an atom?
A state where its potential energy is higher than the ground state
What happens when an atom that is in its ground state is supplied (absorbs) with energy?
Electron(s) move from lower energy levels to higher energy levels (absorption)
The hydrogen spectrum has ____ lines.
Four
A tube filled with gas through which electricity is passed is called a(n) _____.
Gas discharge tube