In 1865, which chemist compared the periodicity of the elements to a musical scale?

• Dmitri Mendeleev

• John Newlands

• Niels Bohr

• Erwin Schrodinger

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NGSS.HS-PS1-1

Before quantum mechanics, scientists envisioned the atomic world as just a ___

• blur of probability densities

• wave-particle duality

• miniature macroscopic world

• gigantic macroscopic world

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NGSS.HS-PS1-1

In 1913, who developed a model for the energy levels of a single electron in a hydrogen atom?

• Dmitri Mendeleev

• Hank Green

• Niels Bohr

• Erwin Schrodinger

Which scientist determined that elements only exist in discrete packets of matter?

• John Dalton

• John Newlands

• Niels Bohr

• Erwin Schrodinger

The energy given off by electrons is emitted in discrete packets called ___

• chunks

• droplets

• quanta

• bytes

In 1913, Niels Bohr came up with a simple model for describing electron energy levels as ___

• probability densities

• wave functions

• three dimensional regions

• circular orbits

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

Electrons don't really behave like particles; they're better described as ___

• waves

• marbles

• planets

• musical beats

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NGSS.HS-PS4-3

For an electron around a nucleus; a standing wave is produced only at certain ___

• harmonics

• energy levels

• quanta

• mismatches

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NGSS.HS-PS4-1

Who developed a mathematical model where the electron was assumed to be a standing wave?

• John Dalton

• John Newlands

• Niels Bohr

• Erwin Schrodinger

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-3

A bit like the individual notes on a keyboard, electrons exist in ___

• grids

• black and white

• orbitals

• rows

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NGSS.HS-PS1-1

NGSS.HS-PS1-2