IS3 Element Families, Valence Electrons & Ion Charge

Refer to your Periodic Table

What is the charge of a Sodium (Na) ion?

• +11

• +1

• -1

• -11

Answer explanation

Na is in Group 1; it has 1 valence electron. It will lose that valence electron

Refer to your Periodic Table

Group 17 atoms will always form ions that have a charge of

• +1

• +17

• -1

• -7

• +7

Answer explanation

Group 17 atoms all have 7 valence electrons. They will gain 1 more electron to have a complete valence shell.

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If an atom has 3 valence electrons, what will be its charge when it forms an ion?

• +3

• +5

• -3

• -5

Answer explanation

The atom will lose its outer 3 electrons when it becomes an ion to expose a full valence shell.

What are cations?

(Choose TWO correct answers)

• positively charged atoms

• negatively charged atoms

• atoms that have gained protons

• atoms that have gained electrons

• atoms that have lost electrons

If an atom gains 3 electrons, what will be it's ion charge?

• +3

• -3

• +5

• -5

If an atom has 1 valence electron, what charge will it have when it becomes an ion?

• +1

• -1

• +7

• -7

Answer explanation

It will lose its one valence electron.

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Refer to your Periodic Table.

How many valence electrons does a Bromine atom have?

• 35

• 17

• 7

• 80

Answer explanation

Bromine is in Group 17. All elements in Group 17 (also known as 7A) have 7 valence electrons.

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If an atom has 6 valence electrons, what charge will it have when it becomes an ion?

• +2

• -2

• +6

• -6

Answer explanation

If it has 6 valence electrons, it needs to gain 2 more to complete its valence shell.

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Refer to your Periodic Table.

If an atom is an alkaline earth metal, what charge will it have when it forms an ion?

• +2

• -2

• -6

• +6

• it will not form an ion; it is inert

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Refer to your Periodic Table.

What is a general chemical characteristic of metals? (Notice their location on the Periodic Table)

• They tend to gain electrons

• They tend to lose electrons

• They have complete valence shells therefore do not gain or lose electrons

Answer explanation

In general, atoms with fewer than 4 valence electrons have metallic properties

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