Group 2 Flashcards
What is a common name given to group 2 metals?
Alkaline earth metals
What is the most reactive metal of group 2?
Barium
List 3 physical properties of group 2 metals
High melting and boiling points Low density metals Forms colourless (white) compounds
The highest energy electrons of group 2 metals are in which subshell?
S subshell
Does reactivity increase or decrease down group 2? Why?
Increases
Electrons are lost more easily because larger atomic radius and more shielding
What happens to the first ionisation energy as you go down group 2? Why?
Decreases because :
- Number of filled electron shells increases down the group—> increases shielding
- increased atomic radius —> weaker force between nucleus and outer electrons.
Less energy needed to remove the electron.
What type of reaction is the reaction between group 2 elements and oxygen?
Redox reaction
Write an equation for the reaction of calcium and oxygen.
2 Ca (s) +O2 (g) —> 2 CaO (s)
What are the products when group 2 elements react with water?
Hydroxide and hydrogen gas.
Which group 2 element doesn’t react with water?
Beryllium
Which group 2 elements reacts very slowly with water?
Magnesium
What type of reaction is the reaction between group 2 metal and water?
Redox reaction
Write an equation for the reaction of Barium and water
Ba (s) + 2H2O (l) —> Ba(OH)2 (aq) + H2 (g)
What is oxidised and what is reduced in a reaction between group 2 metal and water?
Metal —> oxidised
One hydrogen atom from each water —> reduced
What are the products when a group 2 element reduced reacts with an dilute acid?
Salt + hydrogen gas
