Ions have unequal numbers of 

• neutrons and protons.
• protons and electrons.
• electrons and neutrons.

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NGSS.MS-PS1-1

Why do some elements form ions?

• to be stable
• to be happy
• to have more energy
• to create mass

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

When is an atom stable?

• when it has plenty of friends and family that love it
• when it has a full valence electron shell
• when it has an empty valence electron shell
• when its protons equal its neutrons

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

When atoms form ions they obtain an electron configuration similar to a __________.

• metal
• halogen
• alkali metal
• noble gas

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

An atom that loses electrons becomes __________.

• a positive cation
• a negative cation
• a positive anion
• a negative anion

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

An atom that gains electrons becomes __________.

• a positive cation
• a negative cation
• a positive anion
• a negative anion

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Ionic bonds occur between __________ atoms.

• two metal
• two nonmetal
• metal and nonmetal
• two noble gas

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NGSS.HS-PS1-1

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_____ tend to form negative anions.

• metals
• nonmetals

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

_____ tend to form positive cations.

• metals
• nonmetals

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

As an ion, magnesium has a ____ charge.

• 2+
• 2-
• 1+
• 1-

Tags

NGSS.HS-PS1-1