What did Democritus contribute to the atomic theory or chemistry?
He came up with the atom
What did Dalton contribute to the atomic theory or chemistry?
All atoms of different elements are different
what did Thomson contribute to the atomic theory or chemistry?
He discovered the electron
what did Rutherford contribute to the atomic theory or chemistry?
He discovered the nucleus
What did Bohr contribute to the atomic theory or chemistry?
He discovered that electrons move in specific layers.
in the modern model of the atom, do we know the exact location of electrons at a given time?
no. electrons are always rapidly moving around the nucleus
what are protons?
protons determine what an element is
what are electrons?
electrons are negatively charged particles in an atom that are involved in the formation of chemical bonds
what are neutrons
they are particles of the nucleus that have no charge
what are isotopes?
atoms that have different number of protons
where are protons located in an atom?
they are located in the nucleus
where are electrons located in an atom?
in the electron cloud or "cloud"
where are neutrons located in an atom?
in the nucleus
what do the protons charge?
what do the electrons charge?
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