Forming Ions

An example of a CATION is

• Ca⁺²

• In⁺³

• Li⁺¹

• All of these are cations.

Alkali metals (Group 1 metals) form

• +1 ions

• +2 ions

• -1 ions

• -2 ions

The halogens (Group 17)

• have 7 valence electrons.

• form -1 ions

• are the most reactive family of nonmetal elements.

• All of these are true.

Noble gas elements (Group 18)

• never form ions

• are highly reactive

• form +8 charged ions

• form -8 charged ions

Nonmetals in Group 15

• form -3 charged ions

• form +5 charged ions

• form +3 charged ions

• form -5 charged ions

The octet rule ...

• is why stop signs are octagons.

• describes what elements do to be more stable.

• is a rule to live by.

• describes why octopus is a delicacy.

Which ion is correctly written?

• H⁺¹

• Be^-2

• O⁺²

• F^-2

Match the following

• Equal number of protons and electrons

• 0

• Lost 2 Electrons

• -

• Lost 1 Electron

• +

• Gained 1 Electron

• -2

• Gained 2 Electrons

• +2

How does a sodium atom become a sodium ion?

• by gaining one electron

• by losing one electron.

• by gaining one proton

• by losing one proton

How many electrons are needed in the outer energy levels of an atom to be stable? (That than H and He)

• 2
• 4
• 6
• 8