Unit 2 and 3 Review PT Table

Which occurs if an electron transitions from n = 5 to n = 2 in a hydrogen atom?

• Energy is released, and visible light is emitted.

• Energy is absorbed, and visible light is not emitted.

• Energy is absorbed, and visible light is emitted.

• Energy is released, and visible light is not emitted.

Which element has 8 valence electrons?

• Hydrogen

• Oxygen

• Neon

• Potassium

Which best represents the electron configuration for an atom of iron?

• 1s²2s²2p⁶3s²3p⁶4s²4d⁶

• 1s²1p⁶2s²2p⁶3s²3p⁶4s²

• 1s²2s²2p⁶3s²3p⁶4s²3d⁶

• 1s²2s²2p⁶3s²3p⁶3d⁸

Which is the correct noble gas electron configuration for Gallium?

• [Ar]4s²4d¹⁰4p¹

• [Ar]4s²3d¹⁰4p¹

• [Ar]4s²3d¹¹

• [Ar]4s²4p¹

What is the name of the group containing the most electronegative elements?

• alkali metals

• halogens

• alkaline earth metals

• noble gases

The table below shows the electron configurations of three elements. What is the order of the elements from SMALLEST to LARGEST atomic radius size?

• Element 1, Element 3, Element 2

• Element 2, Element 1, Element 3

• Element 2, Element 3, Element 1

• Element 1, Element 2, Element 3

Choose the term that best matches each sentence

• λ

• Smallest amount of energy gained or lost by an atom.

• frequency

• Distance between 2 successive crests on a wave

• c

• Measured in Hz

• quantum

• 3.00 x 10⁸ m/s

• photon

• Light particle

Rank the following forms of radiation from shortest to longest wavelength: A. blue, B. red, C. microwave, D. gamma rays. Type the letter in the blank. In capital letters.

Rank the following forms of radiation from slowest to fastest frequency: A. blue, B. red, C. microwave, D. gamma rays. Type the letter in the blank. Slowest: _______ : Fastest: _______

Rank the following forms of radiation from highest to lowest energy: A. blue, B. red, C. microwave, D. gamma rays. Type the letter in the blank. Highest: _______ : Lowest: _______