Bohr & Electrons

Why did Bohr choose to work with hydrogen?

• The nucleus of hydrogen is small.
• Hydrogen has only 1 electron.
• The element chooses the scientist; it is not often clear why.
• Hydrogen is affordable.

Bohr found that when atoms absorb precise amounts of energy (quanta), the electron(s) will

• move to another atom.
• fall into the nucleus.
• move to higher energy levels.
• go to ground state.

How many electrons can reside in the third energy level?

• 8
• 18
• 10
• 6

Electrons will spread out among each orbital before pairing.

• True
• False

What is the electron configuration for cobalt?

• 1s²2s²2p⁶3s²3p⁶4s²3d⁷
• 1s²2s²2p⁶3s²3p⁶4s²4d⁷
• 1s²2s²2p⁶3s²3p⁶3d¹⁰3p⁶4s²4d⁷
• 1s²2s²2p⁸3s²3p⁸3d⁹

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Why are noble gases stable elements?

• Their energy levels are filled.
• Their nucleus is not charged.
• They do not use d sub-levels.
• They always have balloons.

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When an electron moves toward the nucleus, energy is

• absorbed.
• emitted.
• repelled.
• refracted.

An emission spectrum is produced when

• electrons move to lower levels.
• atoms absorb energy.
• electrons move to higher levels.
• atoms have too much energy.

When the electron in a hydrogen atom returns to ground state, energy is emitted in the ________ region.

• visible
• infrared
• ultraviolet
• red

In an electron configuration, the 3d sub-level fills before the 4s sub-level.

• True
• False