3.1.2. Group 2 Flashcards
What sub-shell are the highest energy electrons in group 2 metals found?
The S subshell
What charge are the ions of group 2 metals?
2+ ions
What type of reaction do group 2 metals undergo?
The loss of electrons in redox reactions to form 2+ ions
What is the trend of reactivity down group 2?
The reactivity increases down group 2.
Electron shielding and atomic radius increases.
Nuclear attraction between outermost electron and nucleus decreases.
Electrons are lost more easily.
What is the trend of first ionisation energy down group 2?
The first ionisation energy decreases down group 2.
Electron shielding and atomic radius increases.
Nuclear attraction between outermost electron and nucleus decreases.
Less energy is required to lose the outermost electron.
What is the product of Metal + oxygen?
Metal + Oxygen → Metal oxide
What are the products of Metal + water
Metal + Water → Metal Hydroxide + Hydrogen
Which Group 2 metal does not react with water?
Beryllium:
Small atomic radius and electron shielding.
Nuclear attraction is high,
High first ionisation energy.
A large amount of energy is required to remove the outermost electrons.
Which group 2 metal reacts slowly with water?
Magnesium:
Small atomic radius and electron shielding.
Nuclear attraction is high,
High first ionisation energy.
A large amount of energy is required to remove the outermost electrons.
In redox reaction between metal and water, which is oxidised and reduced?
Metal - oxidised
Water - reduced
What products are Metal + dilute acid?
Metal + Dilute acid → Salt + Hydrogen gas
What products are formed Metal Oxide + Water?
Metal Oxide + Water → Metal hydroxide
What is the trend of hydroxide solubility of Metal oxides down group 2?
Hydroxide solubility increases down the group.
What is the trend of the alkalinity of solutions formed when metal oxides react with water down the group?
The alkalinity increases as the solubility of he metal oxides increases down the group.
What is Ca(OH)2 used for and write the reaction?
Ca(OH)2 (aq) + 2HCl (l) → 2H2O (l) + CaCl2 (aq)
To neutralise soil.
What is Mg(OH)2 and CaCO3 used for?
Used as an antacid for indigestion.
