Bohr's Models

Bohr's Models

Bohrs Model

Electrons orbit the nucleus in orbits that have a set size and energy.

2. The lower the energy of the electron, the lower the orbit.

3. This means that as electrons fill up the orbitals, they will fill the lower energy level first.

4. If that energy level is fill (or at capacity), a new energy level will begin.

5. Radiation is when an electron moves from one level to another.

Bohr Atomic Models

Bohr diagrams show electrons orbiting the nucleus of an atom somewhat like planets orbit around the sun.

The shell closest to the nucleus is called the K shell, next is the L shell, next is the M shell.Each shell can only hold certain number of electrons.

K shell can have 2, L can have 8 , M can have 18 electrons and so on.

Valence Electrons

Multiple Choice

How many electron shells does this atom have?

• 1
• 2
• 3
• 4

Multiple Choice

How many valence (outer) electrons does an Oxygen atom have?

• 2

• 6

• 8

• 16

Multiple Choice

What element is represented in this Bohr Model? 

• Carbon
• Hydrogen
• Aluminum
• Lithium

A Day with Professor Dave Explains

"Bohr Model of the Hydrogen Atom"

Photon

a tiny particle that comprises waves of electromagnetic radiation.

Move at the speed of light

Quantized

only specific values are allowed

Bohr Model of the Hydrogen Atom

based on the nonclassical assumption that electrons travel in specific shells, or orbits, around the nucleus.

Bohr explained the hydrogen spectrum in terms of electrons absorbing and emitting photons to change energy levels

A Day with Professor Dave Explains

"Quantum Mechanics of an Electron" and Wave Particle Duality & the Photoelectric Effect"

Quantum Mechanics

study of the motion of objects that are atomic or subatomic in size and thus demonstrate wave-particle duality.

electrons behave like waves and particles

we cannot specify accurately the location of an electron. All we can say is that there is a probability that it exists within this certain volume of space

Atomic Emission Spectra

Ground state of an atom is the lowest energy state of the atom. When those atoms are given energy, the electrons absorb the energy and move to a higher energy level.

Atomic Emisions Spectra

Excited state of an atom is a state where its potential energy is higher than the ground state.

An atom in the excited state is not stable. When it returns back to the ground state, it releases the energy that it had previously gained in the form of electromagnetic radiation

What do you think is happening in this image?

Atomic Emission Spectrum

is the pattern of lines formed when light passes through a prism to separate it into the different frequencies of light it contains.