Atomic Structure

hello...

Note: the atomic emission spectrum of an element is the set of frequencies of the electromagnetic waves emitted by atoms of the element. it is different from visible spectrum because visible spectrum is a continuous range of colours while in atomic emission spectrum consists of several individual lines of colour.Each element's atomic emission spectrum is unique and can be used to determine if that element is part of an unknown compound.

at the beginning of class, we looked at the atomic emission spectrum of the noble gasses. I was having trouble seeing the spectrum and only saw few of them...

starting from left to right...

for hydrogen, I saw red, blue and purple
Argon = red, orange, yellow, green, blue and purple
Iodine = red yellow green
Helium = red, orange, yellow, green
for the last two elements we did........i didn't saw any spectrum......hope you got 'em ^_^

after that "mini-light" show, we corrected our homework that was given out last Friday "Atomic Structure Assignment 1"

here are the questions and answers (front side)

1. define the terms wavelenght and frequency.
- wavelenght is the distance between two crest - frequency is the number of cycles that pass a point in 1 second.

2. arrange the following types of electromagnetic radiation in order of increasing wave lenght: Ultraviolet waves, microwaves, radio waves and X rays.
- X rays, Ultraviolet waves, microwaves and radio waves

3. state which type of electromagnetic energy--ultraviolet light or infrared light--has the a) shorter wave lenght b) higher frequency c) lower energy
- a) ultraviolet light b) ultraviolet light c) infrared light

4. describe the difference between a continuous spectrum and a line spectrum.
- continuous spectrum is a pattern of colours - line spectrum is a pattern of single line

5. hydrogen's emission spectrum has 4 lines on it. what does each line represent?
- it represent an electron falling 1 energy level to the next energy level

6. what is a line spectrum and how is it produced?
- line spectrum = pattern of single line, produced when light consists of only a few distinct wavelengths pass through a spectroscope

7. describe how spectroscopy can be used to identify a gas.
- used to identify ions in a solution, specific ions give off a characteristic colour by passing the light from flam tests.

8. write a paragraph that explains the chemistry behind a fireworks display, include the ground state, excited state, Bohr model of atom, flame test.
- DUE THIS WEDNESDAY!!

(back side)

2. which part of the electromagnetic spectrum do the atomic emission spectra show?
- the visible spectrum

3. would the atomic emission spectrum for each sample change if you repeated the procedure?
- No, because each element has its own atomic emission spectrum and all elements has different spectrum

4. what does each line in an atomic emission spectrum represent?
- it represent the energy of electrons


I choose you....................ALLEN to be the next scribe!

vehcsur out..........