atom
jj thompson ⭐
discovered the electron
robert milkan ⭐
discoverd the structure of the atom
elements
radiation
becquerel
discovered radioactivity (1896)
this was a crucial discovery for the creation of atom bombs
nucleus (center)
elecctrons orbit with negative
protons stick to centor with positive
rutherford ⭐
rutherford ⭐
discoverd the different particals
atoms emit particals that are radioactive
alpha particle (discovered by rutherford)
has two positive protons
helium
beta partical
when electrons leave atoms
runs mri's
makes gamma rays
ray= +energy -mass
gamma rays
energy from a decomposing atom
high penetration
takes 4 billion years to make
aristotle
democrutus
greek philophopheser
was wrong on the structure of an atom
makes a flash on contact with zinc
radioactivity
gold foil experiment
they have a lead box with radio active material inside
drill a hole on the side
get gold foil and put a screen around zinq around it
when the radiation shot as it it would show that the particals hit the gold went through and hit one part of the zinq
some got sent back and thats becouse it hits a gold particle and gets bounced back 
the ones that made it through show that there are space in between the atoms
niels bohr
he found that electrons have different energy levels
electrons can make more space from the atom to absorb more light
ground 1
2
3
was right on the structure of an atom
atomic structure
atomic number
the number of protons in the nucleus
rows=layers of electrons
1st=7
2nd=8
3rd=32
ion
an atom where the negatives are not equal to the positives
mass number
the total amount of protons and nuetrons in a nucleus
isotope
atoms of the same element that are heaver becouse of extra nuetrons
periodic table
dmitri mendeleev
inventor of table
gilbert lewis
came up with covalent bonds
(he sucks)