Ions

What is an ion?

• An atom that has lost or gained protons
• An atom that has lost or gained neutrons
• An atom that has lost or gained electrons
• An atom with a charge of zero

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NGSS.MS-PS1-5

Which electrons are lost or gained when an atom forms and ion?

• core electrons
• valence electrons

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What is an atom's oxidation number?

• The number of electrons gained or lost when forming an ion.
• The number of valence electrons.
• The number of protons and neutrons in the atom.
• The number of core electrons retained during the formation of an ion.

If an atom loses electrons when forming an ion, the charge will be:

• positive
• negative
• neutral

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

If an atom gains electrons when forming an ion, the charge will be:

• positive
• negative
• neutral

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

Why do atoms ionize?

• To achieve an octet of valence electrons.
• To achieve a lower energy state.
• To stabilize electron energy states.
• All of these are correct.

If an atom loses two valence electrons, what is its oxidation number?

• -1
• +1
• -2
• +2

What is the typical oxidation number for all elements in the Alkali Metals group?

• +1
• +2
• +3
• +4

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NGSS.HS-PS1-1

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What is the typical oxidation number of the Noble Gases?

• +2
• -3
• -1
• 0

Due to electron shielding of the d sublevel electrons, the transition metals and post-transition metals form multiple ions with different oxidation states.

• true
• false

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NGSS.HS-PS1-1

NGSS.HS-PS1-2