8.1 Group 2 Flashcards
Names for group 2 elements
Alkaline Earth metals
How are group 2 elements found on earth?
Found as stable compounds
How many electrons in the outer shell for group 2 elements?
2 electrons
Which sub shell are the outer electrons in?
Outer s sub shell
Most common type of reaction for group 2 elements
Redox reactions
What happens during redox of group 2 elements?
Each atom is oxidised, losing two electrons to form a 2+ ion
Acts as reducing agent for another species
General formula of group 2 oxides
Metal oxide
MO
What happens when Magnesium reacts with air?
Burns with a bright white light
Forms white Magnesium Oxide
What is formed when group 2 elements react with water?
Alkaline hydroxide and hydrogen
What happens to reactivity going down the group?
Reactivity increases
Metal + acid =
Salt + hydrogen
Why does reactivity increase going down group 2?
Increasing atomic radius
Increased shielding
Less electrostatic force of attraction between outer electrons and nucleus
Easier to lose electrons, therefore more reactive
What happens to ionisation energies going down group 2?
Ionisation energy decreases, due to increased atomic radius and increased shielding
What happens when group 2 oxides react with water
OH- ions are released and form alkaline solutions of metal hydroxide
Solubility of group 2 hydroxides
Slightly soluble in water
When solution becomes saturated, further metal and hydroxide ions will form a solid precipitate
