HC Ch 11 Review

Electromagnetic radiation is:

• wave-like energy that can travel through space

• a type of chemical reaction that emits light and heat

• a form of matter

• a type of nuclear reaction

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Electromagnetic radiation represents the propagation of ​ (a)   through space in the form of ​ (b)   .

• energy
• matter
• waves
• particles

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An atom is in an excited state when it has ​ (a)   energy and one or more of its electrons have moved to a ​ (b)   energy level.

• absorbed
• released
• higher
• lower

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Atoms do not gain or emit radiation

randomly, but rather do so only in discrete bundles of radiation called _____.

• photons

• electrons

• gamma rays

• alpha particles

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Bohr’s model of the atom used _______ to describe electrons.

• circular orbits

• regions of space

• regions of probability

Explain what is meant by the term orbital.

• A region in an atom where there is a high probability of finding electrons.

• A fixed path around the nucleus where electrons revolve.

• The central part of an atom containing protons and neutrons.

• A type of chemical bond formed by the sharing of electron pairs.

The symbol for the lowest-energy hydrogen orbital is:

• 1s

• 2s

• H1

• 0

Which are symbols for the orbitals that constitute the third principal energy levels?

• 3s

• 3p

• 3d

• 3f

• 3g

Which are symbols for the orbitals that constitute the fourth principal energy levels?

• 4s

• 4p

• 4d

• 4f

• 4g

Electron spin is a fundamental property of electrons, similar to charge and mass. How many possible values for electron spin are there?

(type number only - no words)