Electrons in Atoms

Which of the following elements has a full outer energy level of electrons?

• krypton

• strontium

• iodine

• sodium

Tags

NGSS.HS-PS1-1

Which element has 2 valence electrons?

• beryllium

• helium

• sodium

• boron

• silicon

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which of the following elements has 5 valence electrons?

• boron

• phosphorus

• magnesium

• chlorine

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

How many total electrons does a neutral atom of copper have?

• 29

• 11

• 63

• 14

Tags

NGSS.HS-PS1-1

How many valence electrons does an atom of fluorine have?

• 3

• 5

• 7

• 9

• 17

Tags

NGSS.HS-PS1-1

Which change occurs when an atom in an excited state returns to the ground state?

• Energy is emitted

• Energy is absorbed

• The number of electrons decreases

• The number of electrons increases

Tags

NGSS.HS-PS1-4

If the wavelength of an electromagnetic wave is longer, what is true about the energy?

• Energy is higher.

• Energy is lower.

• Energy is not dependent on wavelength.

• Energy is cancelled out.

Tags

NGSS.HS-PS4-1

Light is a form of 

• energy
• radiation
• reflection

Tags

NGSS.HS-PS4-3

NGSS.HS-PS4-4

All waves carry

• energy
• light 
• matter
• particles

Tags

NGSS.HS-PS4-5

True or False: Electrons can exist in between energy levels.

• TRUE
• FALSE