Elements and Bohr Models

What does the period number tell you about an element?

• Number of energy levels

• Number of valence electrons

What does the group number tell you about an element?

• The number of energy levels

• The number of valence electrons

What period is this element located in?

• 2

• 20

• 4

• 3

Which subatomic particle identifies an element?

• Proton

• Neutron

• Electron

• Nucleus

How many protons are in an atom of Phosphorus, P?

• 30

• 15

• 16

• 31

How many energy levels are in an atom of aluminum, Al?

• 1

• 3

• 4

• 2

How many valence electrons are in this element?

• 7

• 6

• 5

• 2

Tags

NGSS.MS-PS1-1

Which element has the same number of electrons in the outer energy level as Oxygen?

• Boron, B

• Carbon, C

• Neon, Ne

• Sulfur, S

How many energy levels does this element have?

• 2

• 5

• 3

• 1

How many valence electrons does this element have?

• 3

• 4

• 2

• 1

Tags

NGSS.MS-PS1-1