3.2.2 - group 2 the alkaline earth metals Flashcards
Trend in atomic radius down group 2
Atomic radius increases as you go down the group
Why does atomic radius get bigger Down group 2
Increased number of e-
Increased number of shells
Electronegativity down group 2 trend ?
Decreases down group 2
Why does electronegativity decrease down group 2
Increased number of shells
Increased dist from nucleus
Nucleus cannot attract electrons in a covalent bond so easily
Trend in mp down group 2
Melting points decrease down group 2
Why does melting point decrease down group 2
As you go down the group
Metal becomes bigger so e- further away from positive ions and thus have less electrostatic attraction so less energy needed to overcome bonds
Trend in ionisation energies down group two
First ionisation energy decreases down the group
Ionisation energy decreases down group 2 because
Each element down group 2 has an extra electron shell compared to the one above
The extra inner shells shield the outer e- from attraction of the nucleus
Extra shell outer e- further from nucleus, weaker attraction so e- can be removed more easier
Reactivity down group 2
As you go down the group reactivity increases
Group 2 metals more reactive down the groupwhy
As you go down the group first ionisation energy decreases
This is due to increasing atomic radius and shielding effect
When group 2 metals react they loose e-., the easier to loose e- (lower the first nd second ionisation energy) the more reactive the element so reactivity increases down the group
Group 2 metals + water gives
Metal hydroxide + hydrogen
When group 2 metals react with water the water acts as
Oxidising agent
Trends in solubility of hydroxides down group 2
Hydroxides increase in solubility down the group
Trend in solubility of sulphites down group 2
Sulphates decrease in solubility down the group
Although sulfates decrease in solubility did a group they are still somewhat soluble what is the anomaly
Barium sulfate (BaSO4)
Baso4 forms a _____ precipitate
White precipitate
