atomic structure and periodic table ππππ§ͺ Flashcards
whatβs an isotope
same number of protons different number of neutrons
where is the atomic number
the bottom
what is relative atomic mass / mass number
number on the top
how to calc relative atomic mass
percentage X amount / 100
where are the metals and non metals on the periodic table
metals- left
non metals- right
groups
alkali metals
transition metals
halogens
noble gasses
whatβs an alloy
mixture of different metals
what is a molecule
group of atoms chemically bonded together
what is a giant covalent structure and examples
molecules with many atoms
carbon
sulfur
different examples of carbon atoms bonded
diamond
graphite
whatβs a compound
contains atoms of two or more different elements chemically bonded together
different types of compound
covalent
ionic
what type of bonding is ionic
metal and non mental ions
what type of bonding is covalent
all non metals bonding
where are electrons
in shells around nucleus
attraction to positively charged protons
how to find out number of electrons in an element
atomic number
J.J thompson
discovered electron
subatomic particles are evenly distributed in the atom
βplum pudding modelβ
john dalton
atoms weee first described as solid spheres
rutherford
alpha scattering experiment-mass concentrated at the centre. the nucleus is charged. most of the mass is in the nucleus,
most of the atom is empty space
bohr
electrons are in shells orbiting the nucleus
chadwick
discovered that there are neutrons in the nucleus
simple distillation
separating a liquid from a solution
fractional distillation
separating out a mixture of liquids
used to separate crude oil into fractions
halogens
non mental
go down- less reactive
go down-melting and boiling points become higher