Valence Electrons & Lewis Dot Diagrams. Groups and Families

What energy level is the valence shell for sodium (Na) atoms?

• 1st energy level

• 2nd energy level

• 3rd energy level

• 4th energy level

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NGSS.HS-PS1-1

How many electrons do atoms "want" according to the octet rule?

• 2

• 4

• 6

• 8

Why do atoms gain or lose electrons?

• To balance protons and neutrons

• To achieve a full outer electron shell

• To increase atomic mass

• To become larger in size

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NGSS.HS-PS1-1

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How can the periodic table help you identify the number of valence electrons in an atom?

• Look at the atomic mass

• Use the element's group number

• Look at the period number

• Count the number of protons

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

What is the monatomic ion for chlorine (Cl)?

• Cl⁺

• Cl^2-

• Cl^-

• Cl³⁺

What is the formula of ion for magnesium (Mg)?

• Mg⁺

• Mg²⁺

• Mg^3-

• Mg^-

The common ion for aluminum (Al) is

• Al⁺

• Al²⁺

• Al³⁺

• Al^-

Valence electrons are important because they (a)  

• They determine the number of proton
• They determine chemical properties
• They affect the atom's mass
• They determine an element’s state 

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NGSS.HS-PS1-1

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How do Lewis dot diagrams compare for elements in the same group?

• They have different numbers of valence electrons (dots)

• They are similar because they have the same number of valence electrons (dots)

• They have the same chemical symbols but no dots

• They are identical in every way

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

How many valence electrons does carbon (C) have in its Lewis dot diagram?

• 2

• 4

• 6

• 8

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NGSS.HS-PS1-1