The Formation and Characteristics of Ions in Chemistry

This lesson explains ions, their formation, and their charges. It covers how atoms become ions by gaining or losing electrons, resulting in cations or anions. Examples include sodium and oxygen ions, with practice on calcium and chloride ions. The lesson also discusses the behavior of metals and non-metals, and the charges of group elements. It concludes with a summary of ion formation and their electronic structure similarity to noble gases.

What happens to an atom when it loses electrons?

• It remains neutral.

• It becomes positively charged.

• It becomes a noble gas.

• It becomes negatively charged.

Which of the following is a correct representation of a sodium ion?

• Na-

• Na+

• Na2+

• Na2-

How many electrons does oxygen gain to form an oxide ion?

• Two

• Three

• One

• Four

What is the electronic structure of a calcium ion?

• 2, 8, 8, 8

• 2, 8, 2

• 2, 8, 8, 2

• 2, 8, 8

Which noble gas has the same electronic structure as a chloride ion?

• Krypton

• Neon

• Argon

• Helium

What do sodium and magnesium have in common regarding ion formation?

• They both lose electrons.

• They both gain electrons.

• They both form anions.

• They both have a negative charge.

Which group in the periodic table does oxygen belong to?

• Group 7

• Group 6

• Group 5

• Group 8

How many electrons does fluorine gain to form an ion?

• Four

• Three

• One

• Two

What type of charge does a cation have?

• Variable

• Neutral

• Positive

• Negative

What is the main characteristic of ions compared to their nearest noble gas?

• They have more electrons.

• They have a different atomic number.

• They have fewer electrons.

• They have the same electronic structure.