Electrons Practice Bank

Which element has 2 valence electrons?

• beryllium

• helium

• sodium

• boron

• silicon

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

• krypton

• strontium

• iodine

• sodium

Which of the following elements has 5 valence electrons?

• boron

• phosphorus

• magnesium

• chlorine

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

• 29

• 11

• 63

• 14

How many valence electrons does an atom of fluorine have?

• 3

• 5

• 7

• 9

• 17

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

Cell phones and Wi-Fi use this type of EM wave.

• radio wave

• microwaves

• gamma wave

• ultraviolet

Which portion of the electromagnetic spectrum includes the range of light that can be detected by the human eye? 

• ultraviolet light
• visible light
• infrared light
• x-rays

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.

Which of the following electromagnetic waves transfers heat?

• ultraviolet light

• x-rays

• gamma rays

• infrared rays