Unit 2 Test

According to the Bohr model of the atom, which particles are allowed to exist in any one of a number of energy levels?

• protons

• nuclides

• neutrons

• electrons

Match the following descriptions with the correct electron state in the Bohr model.

• Location where electrons are found in quantum mechanics

• in the electron cloud

• Lowest energy state of an electron

• in the orbit farthest from the nucleus

• Highest energy state of an electron

• midway between two orbits

• Unstable position of an electron

• in the orbit closest to the nucleus

What is the correct notation for a sublevel within the first energy level?

• 1s

• 1f

• 1d

• 1p

How many electrons are present in an atom of calcium that has the electron configuration 1s²2s²2p⁶3s²3p⁶4s²?

• 6

• 36

• 20

• 16

Tags

NGSS.HS-PS1-1

The ground-state electron configuration of neon is 1s²2s²2p⁶. In this arrangement, how many of neon’s p orbitals (each of which can hold 2 electrons) are completely filled?

• 2

• 6

• 1

• 3

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NGSS.HS-PS1-1

Separating unpaired electrons into as many orbitals as possible

• results in more valence electrons.

• produces a greater spin quantum number.

• minimizes the repulsion between electrons.

• places the electrons farther from the nucleus.

John Dalton thought that atoms (a)  

• cannot be broken down further
• contain molecules
• have no mass
• are all composed of carbon

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NGSS.MS-PS1-1

In 1911, Ernest Rutherford conducted his now famous goldfoil experiment. During the experiment, alpha particles bombarded a thin piece of gold foil. The alpha particles were expected to pass easily through the gold foil. Every now and then, however, an alpha particle bounced back—an unexpected result. Rutherford concluded that these particles were striking

• a tiny region with a strong magnetic field.

• a tiny region of positive charge.

• a dense region of negative charge.

• a dense region of neutrons.

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NGSS.HS-PS1-8

Electrons can be found

• inside protons

• moving rapidly outside the nucleus

• inside neutrons

• attached to the nucleus

Match the following particles with their charges.

• neutron

• positive

• proton

• neutral

• electron

• negative

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NGSS.HS-PS1-3

NGSS.HS-PS3-5