Science - Chemistry: Important Groups Flashcards
1
Q
group 1
A
alkali metals
- react explosively with water
- all elements have 1 valence electron
2
Q
group 2
A
alkali earth metals
- turn water alkaline
- commonly found in earth’s crust
- all elements have 2 valence electrons
3
Q
group 17
A
halogens
- ‘salt formers’
- react with metal ions to form salts
- have 7 valence electrons
4
Q
group 18
A
noble gases
- exist as single atoms
- hardly ever in chemical bonding
- have full valence shell
5
Q
reactivity of group 1
A
all highly reactive because they can easily lose their 1 electron
6
Q
reactivity of group 2
A
quite high reactivity because only 2 valence electrons
7
Q
reactivity of group 17
A
highly reactive because they only need to gain one electron to form a full shell
8
Q
reactivity of group 18
A
unreactive/inert because of full outer shell
