Bohrs model

In order for an atom to be neutral what has to be true?

• The atom has more protons than neutrons
• The atom has more neutrons than protons
• The atom has the same number of protons and neutrons
• The atom has the same number of protons and electrons

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NGSS.HS-PS1-7

Which subatomic particle has a negative charge in the atom?

• proton
• neutron
• electron
• quark

Most of the mass in an atom is made up of _____________________?

• protons and electrons
• protons and neutrons
• neutrons and electrons
• electrons and quarks

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NGSS.HS-PS1-7

What is the image a picture of?

• Einstein Model

• Bohr Model

• Pierre Model

• Newton Model

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

To excite an atom, there needs be...

• Absorption of energy

• Emission of energy

• Movement of electrons

• A proton

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NGSS.HS-PS1-4

What is n defined as in Bohr's model of the atom?

• A quantity

• Principal quantum variable

• A letter

• Principal quantum number

In Bohr's model, how do electrons travel?

• Electrons move in and out of the nucleus

• Electrons do not move

• Electrons move in circular orbits around the nucleus

• Electrons move in a straight line

According to the Bohr model of the atom, the single electron of a hydrogen atom circles the nucleus

• in specific, allowed orbits.
• in one fixed orbit at all times.
• at any of an infinite number of distances, depending on its energy.
• counterclockwise.

If electrons in an atom have the lowest possible energies, the atom is in the

• ground state.
• inert state.
• excited state.
• radiation-emitting state.

When atom _________ energy, the electron excites to higher energy level. The electron is ________ at higher state. The electron then ________ energy by emitting light when it falls back to lower energy level

• absorbs, stable, absorbs

• absorbs, unstable, loses

• loses, unstable, loses

• loses, stable, absorbs

Tags

NGSS.HS-PS1-2