unit 3 chemistry

Nuclear atom

Positively charged, dense nucleus

The nucleus is most of the atoms mass but very little volume

The nucleus is made of protons and neutrons

The visible spectrum is only… of the electromagnetic spectrum

0.0035%

Wavelength

The length of a wave

Frequency

Number of wages that pass a fixed point in 1 second

Crest

Top of the wavelength

Amplitude

Height of the wave

Trough

Bottom of wave length

Speed

All wave travels at the speed of light

E=energy

The difference in energy levels (joule,j)

Young’s double slit experiment found that

Light is a wave

Constructive interference

Produce bright spots

Reconstructive interference

Produces dark spots

Photoelectric effect

Red,orange, and yellow don’t have eneough energy to move e-s

Sheds of green have just the right amount

Blue and purple have too much

Dual nature of light

Light is both a wave and a photon

Photon

A particle of light with a specific amount of energy

Neil’s Bohr

Electrons exists in energy levels that are certain distances from the nucleus(orbits)

The energy of electrons is

Quantized

Quantum of energy

The amount of energy absorbed or released to change energy levels

The born model only worked for

Hydrogen so it was ruled that electrons don’t move in orbits, but the do exists in energy levels

The wave mechanical model

Louis debrogile and Erwin Schrödinger

Souble slit experiment but with electrons

Found that electrons are waves

What free Ed a dark spot in double slit experiments

Crest meets with a trough

What for,Ed light spots in the double slit experiment

Rest meets with another crest

Orbital

Region of space whenever there is a 90% chance of finding an electron

Heinsienburgs uncertainty principle

It is impossible to know exactly both the position and the momentum of a particle (noble prize, 1932)

1.n

Describes the main energy level