Valence Electrons

Valence electrons are the...

• Innermost electrons
• Middle electrons
• Outermost electrons
• Any electrons

How many valence electrons does carbon have?

• 4

• 5

• 6

• 7

Which subatomic particle tells the identity of an element?

• Electron Cloud

• Proton

• Neutron

• Nucleus

How many protons does Oxygen, O, have?

• 8

• 5

• 14

• 2

How many electrons are in this element?

• 39

• 19

• 20

• 21

How many neutrons does Sodium (Na) have?

• 11

• 23

• 34

• 12

What does the nucleus consist of?

• Protons + Electrons
• Neutrons + Electrons
• Atoms
• Protons + Neutrons

How many neutrons does Beryllium (Be) have?

• 4
• 2
• 9
• 5

Fill in the blanks in the correct order.

The first energy level holds ____ electrons

The second energy level holds ____ electrons

The third energy level holds ____ electrons

• 1, 2, 3

• 8, 8, 8

• 2, 8, 8

• 2, 4. 8

Describe this element.

• Highly reactive metal
• Highly reactive nonmetal
• Stable
• Less stable non metal