atomic structure Flashcards
(10 cards)
1
Q
lithium in water observations
A
- bubbles slowly
- floats
- moves slowly
2
Q
sodium in water observations
A
- bubbles quickly
- floats
- moves quickly
3
Q
potassium in water observations
A
- bubbles very quickly
- melts into a ball
- floats
- moves very quickly
- flame
4
Q
rubidium in water observations
A
- sinks
- melts into a ball
- explodes with a flame
5
Q
explain why the reactivity of elements changes going down group 1
A
- reactivity increases down the group
- as you go down group 1 the outer electrons is further from the nucleus
- so less attraction between nucleus and outer shell
- so outer electron is lost more easily
6
Q
dangers associated with chlorine
A
toxic
7
Q
why is it hazardous if water came into contact with sodium
A
it is a very exothermic reaction
8
Q
why are reactions carried out in an atmosphere of a noble gas, not air?
A
- noble gases are very unreactive
- oxygen would react with reactant e.g sodium
9
Q
why do isotopes have similar properties?
A
same number of electrons
10
Q
colour of halogens
A
fluorine: pale yellow
chlorine: yellow-green
bromine: red-brown
iodine: dark grey
