Bohr's model of the atom proposed that ___.

• electrons move around the nucleus in fixed orbits
• neutrons move around the nucleus
• neutrons do not exist, but are just paired protons and electrons
• the nucleus spins

Order the atomic models below from the oldest to the most recent.

• 2, 1, 3, and 4

• 1, 2, 4, and 3

• 3, 2, 4, and 1

• 3, 1, 2, and 4

Which of the following correctly describes the electron cloud model?

• Electrons do not follow fixed orbits, but are found more frequently in areas around the nucleus.
• Electrons are found in fixed orbitals around a positive nucleus.
• All of an atom's mass is concentrated in the electron cloud around the nucleus.
• Electrons are evenly embedded throughout a positively charged sphere.

Which orbital is shaped like a sphere?

• s

• p

• d

• f

This energy level holds 8 electrons in total.

• 1st

• 2nd

• 3rd

• 4th

Tags

NGSS.HS-PS1-1

This sublevel can hold up to 10 electrons?

• s

• p

• d

• f

The 3rd energy level can hold up to ___ electrons

• 8

• 18

• 14

• 16

Right before an electron can be placed in the 3 d-orbital, where must electrons go?

• 2 to the 4 s orbital

• 6 to the 4 p orbital

• 10 to the 2 d orbital

• 2 to the 3 f orbital

Tags

NGSS.HS-PS1-1

An atom that has gained energy beyond normal is said to be ...

• excited

• energized

• naturalized

• grounded

How does an atom give up excessive energy when dropping from a higher energy state to a lower state?

• a photon

• a positron

• an electron is expelled.

• a neutron is expelled.