Alkali Metals - Properties in Air

The video discusses the most reactive metals found in group 1 of the periodic table, known as alkaline metals. It covers lithium, sodium, potassium, rubidium, and caesium, highlighting their reactivity and storage methods. Lithium, sodium, and potassium are stored under oil and can be cut with a knife. Rubidium and caesium are stored in sealed glass containers to prevent reactions with oxygen. Caesium is so reactive that it can melt from the heat of a hand.

Which group of the periodic table contains the most reactive metals?

• Group 1

• Group 2

• Group 17

• Group 18

Why are lithium, sodium, and potassium stored under oil?

• To prevent them from melting

• To keep them from reacting with oxygen

• To make them easier to cut

• To enhance their reactivity

Which metal is the easiest to cut with a knife?

• Sodium

• Lithium

• Potassium

• Rubidium

How is rubidium stored to prevent it from reacting with oxygen?

• Under oil

• In a metal box

• In a sealed glass container

• In a vacuum chamber

What unique property does caesium have compared to other alkaline metals?

• It can melt from the heat of a hand

• It is stored under oil

• It is the hardest to cut

• It does not react with oxygen