2.4 Atomic Emission Spectra Flashcards Preview

Chemistry Chapter 2 - Atomic Structure > 2.4 Atomic Emission Spectra > Flashcards

Flashcards in 2.4 Atomic Emission Spectra Deck (8)
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1

How is an emission spectrum produced?

When hydrogen gas at low pressure is subjected to very high voltage in a discharge tube light is emitted by the gas producing an emission spectrum.

2

What is the emission spectrum for hydrogen like?

Spectrum consists of a series of sharp, bright lines on a dark background the lines get closer together at higher frequency/energy.

3

What does does the line spectrum produce for hydrogen mean?

That electrons in an atom are only allowed to have certain amounts of energy.

4

How does an emission spectrum arise?

Passage of the electric discharge causes an electron in an atom to be promoted to a higher energy level. Each line in the emission spectrum arises when an electron falls from a HIGHER to a LOWER energy level. As it returns to the lower energy level the extra energy is given out in the form of a PHOTON of light - this gives a line in the spectrum.

5

When do different series of lines arise?

When the electron fall down to different energy levels.

6

Why do the lines in the emission spectrum get closer together at higher energy?

Before the energy levels in the tom must get closer together in energy at higher energy.

7

What happens at the convergence limit?

The lines merge to form a continuum.

8

What happens beyond the convergence limit?

The electron can have any energy, the electron is no longer in the atom.