Elements Basics

How many valence electrons do group 2A elements have?

• 1

• 2

• 3

• 4

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NGSS.HS-PS1-1

Which elements have the same number of energy levels?

• Hydrogen, Sodium, Potassium

• Lithium, Carbon, Nitrogen

• Neon, Helium, Carbon

• Calcium, Magnesium, Borin

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NGSS.HS-PS1-1

Which element has the same number of valence electrons as oxygen?

• Sulfur

• Potassium

• Neon

• Sodium

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NGSS.HS-PS1-1

Which element has the same number of energy levels as calcium?

• Lithium

• Potassium

• Neon

• Helium

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NGSS.HS-PS1-1

How many electrons can fill the first energy level?

• 2

• 8

• 3

• 10

In which group does this atom belong?

• 1
• 3
• 13
• 11

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NGSS.HS-PS1-1

How many energy levels does an atom of Chlorine have?

• 2
• 3
• 4
• 7

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NGSS.HS-PS1-1

Which element has the same number of valence electrons as this element?

• Bromine (Br)
• Nitrogen (N)
• Calcium (Ca)
• Boron (B)

Tags

NGSS.HS-PS1-1

How many valence electrons does an atom of oxygen have?

• 2
• 5
• 6
• 16

Tags

NGSS.HS-PS1-1

Periods are the rows of the periodic table. How many are there?

• 7 
• 18
• 12
• 20