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
- form 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:
- no. Filled electron shells increases down the group —> increased shielding
- increased atomic radius —> weaker force between outer electron and nucleus —> less energy needed to remove 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
2Ca (s) + O2 (g) —> 2CaO (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 element reacts very slowly with water?
Magnesium
What type of reaction is between group 2 metal and water?
Redox reaction
Write an equation for the reaction of barium and water
Ba (s) + H2O (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 react with a dilute acid?
Salt and hydrogen gas