atomic structure Flashcards
what does filtration separate
insolouble solids from liquids
how do you filter
using filter paper
funnel
beaker
where will the solid be left in filtration
On the filter paper
what does evaporation seperate
separates solouble salts from soloution
what do you need for evaporation
evaporating dish
tripod
bunsen burner
what is the disadvantage of evaporation
thermal decomposition can happen
will be left with more unattractive and smaller crystals
what’s the advantage of evaporation
Quick and easy
what’s crystallisation
also separation of solouble salts from soloution
what’s the process of crystallisation
(look on flash card)
what did JJ thomposon discover
electrons
what was JJ THOMPSONS model like
plum pudding model
ball of positive charge
with negative electrons embedded in it
what did rutherford discover
postitive nucleus by firing positively charged alpha particles at a thin sheet of gold
what was rutherford nuclear model like
positive nucleus with a cloud of negative charge
what did neil’s bohr discover
that the electron was orbiting the positive nucleus in they shell
what did james chadwick discover
neutron
how does an atom become stable
gain a full outer shell
what does the atomic number show(bottom number)
number of protons
(which is the same as number of electrons)
What does mass number show
protons and neutrons
what is the max shells
2,8,8
what does the group show
how many elections are on the outer shell
does losing an electron make it become a positive ion or negative ion
positive
what did mendeleev order the elements according to
properties
did Mendeleev leave gaps
yes for undiscovered elements
What lead to many people believing MENDELEEV
discovery of isotopes - same number of proton diffrent number of neutrons
Allowed elements to be ordered by their properties instead of atomic weight
what is the vertical line called
group
what is horizontal line called
period
what is group 0 called
noble gases
what’s group 1 called
alkalai metals and become more reactive as you go down the attraction between positive nucleus and negative electron becomes weaker
what’s group 7 called
Halogens, less reactive as they go down
where do you find non metals
right
where do you find metals
left
what do metals do in chemical reaction
loses electron to form a positive ion
what do non metals do in chemical reaction
gain electrons to become negative ions
what is an isotope
same number of protons
diffrent number of neutrons
