Unit 3: Atomic Emission Spectra and the Bohr Model

What is the visible spectrum?

The portion of the electromagnetic spectrum that is visible to the human eye

Electromagnetic waves are ______ waves(type)

Transverse

______ and _____ are inversely proportional

Wavelength and Frequency

Wavelengths with highest/lowest energies

Violet(highest); Red(lowest)

Continuous Spectrum

A spectrum that contains radiation distributed over all wavelengths

Emission Spectrum

A spectrum containing radiation of only specific wavelengths

Bohr Model Description

-Each circle represents an orbit

-Where electrons are located

-Larger circles indicate higher energy; Inner circles indicate lower energy

*How can we see light?

When something emits light we are actually seeing a photon. A photon is emitted when electrons lose energy.

Radiation

Radiation is absorbed or emitted when electrons change orbits. When radiation is emitted it is a photon.

What determines the color that is emitted?

The distance travelled(wavelength) determine the color emitted

Quantum

The amount of energy needed to move an electron from one energy level to another

*How is a photon emitted?

1. Energy enters the Bohr Model

2. Electrons get excited and go into excited state

3. Electrons lose energy and go into ground state

4. Photon is emitted and color is determined by wavelength

What is the lowest possible energy level that an electron can occupy?

Ground State

If the hydrogen atom emits red, blue-green, blue, and violet light, how many energy levels does it have in the visible region of the spectrum?

4

Element

Simplest form of matter that has properties(one type of atom)

Atom

Fundamental building blocks of matter

Isotope

Different form of an atom that only differs in the amount of neutrons

Atomic Mass

Number of protons and neutrons an atom has

Atomic Number

Number of protons an atoms has

Electrically Neutral

Equal number of protons and electrons in an atom(atoms in the periodic table are electrically neutral)

Energy

Capacity to move or change matter

Location, charge, and size of each subatomic particle

Protons: Nucleus, Positive, 1 AMU

Neutrons: Nucleus, No Charge, 1 AMU

Electrons: Electron Cloud, Negative, 1/1836 AMU