Understanding Atomic Structure and Electrons

What is the center region of an atom called?

• Electron cloud

• Nucleus

• Proton

• Neutron

Which subatomic particle has a positive charge?

• Electron

• Neutron

• Proton

• Nucleus

What is the approximate width of an atom in picometers?

• 1 pm

• 10 pm

• 100 pm

• 1000 pm

What is the charge of the nucleus of an atom?

• Negative

• Neutral

• Positive

• No charge

Tags

NGSS.HS-PS1-8

Which force holds the electrons in orbit around the nucleus?

• Gravitational force

• Nuclear force

• Electromagnetic force

• Frictional force

Tags

NGSS.HS-PS2-4

What is the mass of a neutron in atomic mass units (u)?

• 0 u

• 0.5 u

• 1 u

• 2 u

How many electrons can the first shell of an atom hold?

• 1

• 2

• 4

• 8

What is the charge of an electron?

• Positive

• Neutral

• Negative

• No charge

Tags

NGSS.MS-PS2-3

Which instrument allows us to see the surface of atoms?

• Electron microscope

• Scanning tunneling microscope (STM)

• Light microscope

• X-ray machine

What is the maximum number of electrons the second shell can hold?

• 2

• 4

• 8

• 18