Chem Test

What is meant by the frequency of a wave? What are the units of frequency? Describe the relationship between frequency and wavelength.

Frequency is the number of wave cycles that pass a given point per unit time. Frequency units are cycles/s or s-1 or Hertz. Wavelength and frequency are inversely related.

Why was Rutherford's model of the atom known as the planetary model?

He used existing ideas about the atom to propose that electrons move around the nucleus like the planets around the sun.

Use a diagram to illustrate each term for a wave a. wavelength b. amplitude c. cycle

Wavelength- the distance between successive crests of a wave, especially points in a sound wave or electromagnetic wave. Amplitude-he distance from the centre line (or the still position) to the top of a crest or to the bottom of a trough. Cycle-The wavelength is the distance from crest to crest, trough to trough,

A mercury lamp emits radiation with a wavelength of 4.36 *10-7 m. What is the wavelength of the radiation in centimeters?

4.36*10-5cm 6.88* 1014s-1

Write out the electron configuration for an arsenic atom. Calculate the total number of electrons in each energy level and state which energy levels are not full.

1s22s22p63s23p63d104s24p3 Level 1, 2 Level 2,8 Level 3, 18 The fourth energy level is not filled.