C1:atomic structure Flashcards
wh at is the mass of a proton
1
what is the mass of a neutron
1
what is the mass of an electron
1/2000
what are compounds
two or more elements chemically
combined
name 4 ways mixtures can be separated
filtration, crystallisation, simple distilation,
fractional distilation
explain what happens in simple distillation
heating a mixture of liquids causing it to evaporate then it is cooled and condenses into a separate liquid.
what is fractional distillation
heating up the mixture and separating the different compounds knowing they have different boiling points
who discovered the plum pudding model
jj Thompson
what did jj thompson discover
the electron
what is the plum pudding model
that the atom is a ball of positive charge with negative charge inside of it
What did rutherford do to get the nuclear model
fired high speed alpha particles at a gold coil
what were rutherfords observations
the mass was concentrated a the centre and the nucleus was charged
what did niels bohr discover
the electrons orbit the nucleus
what did james chadwick discover
the neutron
how did new evidence from the scattering
experiment led to a change in the atomic model
the alpha scattering led to the plum pudding model which replaced the nuclear model
how do you calculate the calculate the
the relative atomic mass of an element given the percentage abundance of its isotopes.
times the atomic mass with the amount of an element and add it with other elements
what did the early periodic table look like
measured in atomic weight, ordered wrongly
how did mandeleev solve this problem
left gaps, in some places he ordered it in atomic , allowed him to predict future elements
what was wrong with Mendeleev’s table
missing isotopes, unable to tell where hydrogen was, from one elemnt to another the increase in atomic number was not correct
what did mandeleev order his periodic table in
relative atomic mass
what happens as you go down group 1
the reactivity increases as you go down
what happens as you go down group 7 elements
reactivity decreases and boiling and melting points increase
what can a more reactive halogen do
displace a less reactive halogen from a aqueous solution from its salt
