Group 1 Elements (Alkali metals) Flashcards
1
Q
Physical properties
A
- soft, cut easily
- low mp/bp
- low densitites (lithium, sodium, potassium float on water)
2
Q
How physical properties change down the group
A
- mp/bp of alkali metals decrease
- densities increase
3
Q
How physical properties change down the group
A
- mp/bp of alkali metals decrease
- densities increase
4
Q
Chemical properties
A
- highly reactive
- stored in oil, prevent reacting with air and water
- 1 valence electron, lose easily to obtain octet configuration
5
Q
Reactivity down the group
A
- size of atom increases
- easier to lose valence electron frm bigger atoms
- reactivity increases down grp
6
Q
React with cold water
A
- alkali and hydrogen formed
- Lithium: quick rxn, floats on water
- Sodium: violent, darts arnd water surface, rxn may be explosive
- Potassium: very violent, explosive rxn
7
Q
Powerful RA
A
- form ions with charge of +1
- losing 1 electron frm outer shell
- give away electrons readily
8
Q
Alkali metals form ionic compounds
A
- compounds have similar chemical formulae
