thomsons theory
what did j.j. Thomson discover
he discovered that an atom is not just a hollow circle but has things called electrons in the atom
it is called the gold foil experiment
Witch Alfa particles passed through
the particles that didnt hit anything passed right through
what are the symbols for protons neutrons and electrons
protons =p+
neutrons =n
electrons= e-
what are the components of daltons theory.
1 everything is made of atoms
2 atoms of the same element are alike
3 different elements have different atoms
4 atoms can be joined together to make compounds
5 atoms are rearranged during chemical reactions
What is thomsons atomic model
he thought the atom was a ball of positive stuff with tiny negative electrons stuck inside it
What did Rutherford expect to see. What happened instead
he thought most Alfa partisans would go through the gold foil but instead what happened id that some where deflected while some bounced back.
Which Alfa particles bounced back
the ones that hit the nucleus bounced back
What is the amu or atomic mass unit of a proton and neutron
1 amu
What was boars atomic model
Bohr said electrons move around the nucleus in a specific orbit around the nucleus
Was thomsons idea true why or why not
thomsons idea was not completely true he did correctly discover that atoms also have negatively charged particals called electrons. He thought that the positive charge was spread throughout the atom with electrons stuck inside
What did Rutherford discover
he discovered that atoms have tiny dance middles called the nucleus
Which Alfa particles where diflected
the particals that came very close to the nucleus where pushed away or deflected
Why are electrons not counted when calculating the atoms mass
Electrons are supper tiny in mass compared to neutrons and protons that they will bearable make a difference in the mass
What is a isotope
An isotope is an atom of the same element that have different numbers or neutrons
What is Rutherford atomic model
his modle showed that their is a tiny dance middle called the nucleus with electrons around it and that it is mostly empty space between them
What is an atomic mass number
the mass number tells you the total number of protons and neutrons combined
Pop questions
what is the difference between an atomic mass number and a cell
an atom is the smallest part in ALL matter cells are the smallest part of ALL LIVING things
What and who discovered the atom
an atom in the tiny foundation of ALL matter and a Greek philosopher Democritus gave the idea of the atom