Atomic Spectra

The unknown emissions spectra belongs to the element

• Hydrogen

• Mercury

• Neon

• Helium

True or False: The ground state is the highest energy state of an atom.

• True

• False

For an electron to change from ground state to an excited stated it must...

• Absorb energy

• Release energy

The parallel lines represents...

• energy levels of the atom

• energy levels of the electrons

• energy levels of the photons

• energy levels of the nucleus

The picture shows an atom in the ground state absorbing energy and the electron jumps to the excited state. Which state has higher energy?

• Ground State

• Excited State

What is another name for an atomic spectrum?

If a mixture contains hydrogen and oxygen, how many lines would you see in the emission spectrum?

• 4

• 11

• 15

• 19

Tags

NGSS.HS-PS4-3

LEDs, or light emitting diodes, produce light by passing an electric current through a mixture of different atoms (or molecules) and then using their combined emission spectra to light up a room, or a string of Christmas tree lights. Why are white LEDs difficult and expensive to make?

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What particle do atoms release after the electrons relax back down to a lower energy state?

• photon

• wave

• quantum

• proton

Tags

NGSS.HS-PS4-3

When energy is applied to atoms, the electrons

• move to a higher state

• move to a lower state

• don't move

• instantly release photons of light

Tags

NGSS.HS-PS1-2