HC 2.3, 2.4, 3.1 Review

Bohr's model of the atom proposed that ___.

• electrons move around the nucleus in fixed orbits
• neutrons move around the nucleus
• neutrons do not exist, but are just paired protons and electrons
• the nucleus spins

A wave of light with a large wavelength will have a ______ frequency and _____ energy

• high, low

• high, high

• low, high

• low, low

For an electron to move toward the nucleus,

• energy isn't involved.
• energy must be absorbed.
• energy must be released.

Which transition involves more energy? (n stands for energy level - think of the rings!)

• n=6 to n=5

• n=8 to n=5

• n=8 to n=2

• n=6 to n=2

For an electron to move away from the nucleus....

• the atom must absorb energy because the electron is moving against an attraction

• the atom must absorb energy because the electron is moving against a repulsion

• the atom must release energy because the electron is moving against an attraction

• the atom must release energy because the electron is moving against an repulsion

An orbital can at most hold how many electrons?

• 1 electron
• 2 electrons
• 3 electrons
• 4 electrons

How does Bohr's model differ from the quantum mechanical model of an atom?

• The quantum model stated that electrons existed in rings around the nucleus while Bohr's model stated that they are somewhere in a cloud.

• Bohr's model states electrons have energies associated with them, while the quantum model states they do not.

• The quantum model states electrons exist in shapes around the nucleus while Bohr's model states electrons exist at a fixed radius.

• Bohr's model allows for electrons to move via absorption/release of energy while the quantum model does not.

Which of the following has 5 valence electrons?

• 1s²2s²2p⁵

• 1s²2s²2p³

• 1s²2s²2p¹

• 1s²2s²2p⁶3s²3p⁶4s²3d⁵

What is the electron configuration for Ti⁺²?

• 1s²2s²2p⁶3s²3p⁶4s²4d²

• 1s²2s²2p⁶3s²3p⁶4s²3d²

• 1s²2s²2p⁶3s²3p⁶4s²

• 1s²2s²2p⁶3s²3p⁶3d²

How many valence electrons does gallium have?

• 1

• 3

• 13

• 8