Electron Configuration

This is a correct dot diagram for oxygen (O)

• true
• false

Tags

NGSS.HS-PS1-1

This is a correct dot diagram for fluorine (F)

• true
• false

Tags

NGSS.HS-PS1-1

What are valence electrons?

• The total number of electrons in an atom

• The number of electrons in the outermost shell

• The number of electrons in the second shell

• The number of protons in the outermost shell

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

How many valence electrons are in an atom of Ar?

• 2
• 8
• 4
• 1

Tags

NGSS.MS-PS1-1

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

• excited

• energized

• naturalized

• grounded

Tags

NGSS.MS-PS1-4

What happens to the energy absorbed by excited electrons as they return to ground state?

• energy turns into visible light

• electrons move to higher energy level

• electrons will be added

• electrons will be removed

Tags

NGSS.HS-PS4-3

Light is emitted when electrons ...

• return from high energy state to low energy state

• jump from low energy state to high energy state

• either of these

• none of these

Tags

NGSS.HS-PS4-3

What atom matches this electron configuration?
1s² 2s² 2p⁶ 3s²

• Neon
• Magnesium
• Aluminum
• Potassium

Tags

NGSS.HS-PS1-1

Which is the electron configuration for an oxygen atom?

• 1s²2s²2p⁶3s²3p⁶4s²
• 1s²2s²2p⁴
• 1s²2s²2p⁶
• 1s²2s²2p⁶3s²3p⁶

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

How many valence electrons are represented here?

• 7
• 5
• 2
• 8

Tags

NGSS.HS-PS1-1