2.05b Quiz: Crash Course Chemistry #5 - The Electron

In the 1860s, Dmitri Mendeleev published this classification of elements and predicted patterns in their properties.

• Periodic Table of the Elements

• Mendeleev Atomic Models

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John Newlands compared the periodicity of elements to:

• Colors of the rainbow

• A musical scale with octaves

Answer explanation

In the 1860s, John Newlands presented his theory of the periodicity of elements to the Royal Academy and was booed off the stage for trying to mix science and art.

In using Bohr's model for describing electron energy levels in hydrogen, electrons are considered as

• Particles

• Waves

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True or false: Applying the Bohr model of the energy levels of electrons in hydrogen works for all elements, especially larger atoms.

• True

• False

Answer explanation

One limitation of Bohr's model is that electrons behave like waves as well as particles.

Electrons behave like particles, but they also behave like standing waves. This is called:

• Wave-particle duality

• Planetary model corollary

Answer explanation

Erwin Schrödinger was the first person to develop a mathematical model that considered the electron as a wave.

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Electrons exist in _________, which are arranged in shells.

• the nucleus

• orbitals

• chords

Answer explanation

The 1s orbital holds how many electrons?

• 1

• 2

• 6

Answer explanation

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Which statement about the octet rule is FALSE?

• Most lighter elements want eight electrons in their outer shell

• The two electrons in the s orbital and six electrons in a p orbital add up to eight electrons in an outer shell

• Elements form isotopes to maximize electrons in their outer shell

Answer explanation

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True or false: the periodic table has information on electron configurations and stability.

• True

• False

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Electrons flow more freely in elements with d orbitals shielded by the next s orbital. These elements are:

• Less reactive, more conductive

• More reactive, less conductive

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