Formation of Ions

When are ions formed?

When electrons are transferred from one atom to another.

What are the simplest ions?

Single atoms which have either lost or gained electrons so as to have a full outer shell.

What do elements of the same group have?

The same number of outer electrons

What do elements have to do for a full outer shell?

Lose or gain electrons

What do elements of the same group form?

Ions with the same charges

How do group 1 elements form ions?

Lose 1 electron to form 1+ ion

How do group 2 elements form ions?

Lose 2 electrons to form 2+ ions

How do group 6 elements form ions?

Gain 2 electrons to form 2- ions

How do group 7 elements form ions?

Gain 1 electron to form 1- ions

What are molecular ions?

Ions that are made up of a group of atoms with an overall charge.

What’s the formula for a nitrate ion?

NO3-

What’s the formula for a carbonate ion?

CO3 2-

What’s the formula for a sulfate ion?

SO4 2-

What’s the formula for a hydroxide ion?

OH-

What’s the formula for an ammonium ion?

NH4+