9.1 The physical and chemical properties of group 2 Flashcards
1
Q
the electron arrangement of group 2
A
have 2 electrons in an outer s-orbital
2
Q
what happens to the size of the atoms as you go down the group
A
atomic radius increases
atoms get bigger
3
Q
what happens to the ionisation energy of the atoms as you go down the group
A
decreases
4
Q
why does ionisation energy decrease as you go down the group
A
- atoms get bigger + extra shells
- valence -ve e- is further away from +ve nucleus
- weakens attraction
- easier to remove valence e-
5
Q
what happens to the melting point as you go down the group
A
decreases
6
Q
why does the melting point decrease as you go down the group
A
- size of metal ion increases
- larger ions = larger distance between e- and nucleus
- weakens attraction
- easier to break bonds = less energy required
7
Q
how does group 2 react with water
A
reacts to form bases
- metal hydroxides
8
Q
what happens to reactivity with water as you go down the group
A
increases
9
Q
how does Mg react with water
A
- slowly with cold water
- vigorously with steam
