GCSE Chemistry - Formation of Ions #13

The video explains why some atoms form ions more readily than others, focusing on the role of electron gain or loss in achieving a full outer shell for stability. It highlights how the periodic table's group numbers indicate the number of electrons in the outer shell, affecting the energy required for ion formation. Group 1 and 2 elements easily form ions due to minimal electron transfer, while groups 3-5 rarely form ions due to high energy demands. The video also demonstrates writing chemical equations for ion formation, using examples like sodium, chlorine, magnesium, and oxygen.

What is an ion?

• A neutral particle

• A charged particle

• A type of molecule

• A stable atom

Why are Group 1 elements likely to form ions?

• They are inert gases

• They have a full outer shell

• They need to gain 3 electrons

• They only need to lose 1 electron

Which group in the periodic table is known for gaining 2 electrons to form ions?

• Group 7

• Group 6

• Group 2

• Group 1

How do you represent the formation of a sodium ion in a chemical equation?

• Na → Na+ + e-

• Na + e- → Na+

• Na+ + e- → Na

• Na → Na- + e+

What happens when chlorine gains an electron?

• It loses its charge

• It forms a chloride ion

• It forms a neutral atom

• It becomes a positive ion