Atomic Structure Concept 1
This subatomic particle is what gives the nucleus an overall positive charge. -
answerProtons
This is the space surrounding the nucleus that has an overall negative charge. -
answerElectron Cloud
This subatomic particle contributes to the overall mass of a atom, but not its charge. -
answerNeutrons
The subatomic particle located in the space surrounding the nucleus. - answerElectrons
The smallest known particles that make up both protons and neutrons. - answerQuarks
Located in the outermost energy level of the electron cloud, with the most energy. -
answerValence electrons
400 BC- Democritus- first to name the atom.
1803- John Dalton- Sphere model, atom is a solid sphere that can't get any smaller.
Elements are made of atoms that have the same mass and compounds are atoms of
different elements combined.
1869- Dmitri Mendeleev- developed the first periodic table, organized by atomic mass.
1904- JJ Thomson- Plum pudding model, the atom is divisible, it is a positively charged
sphere with negative particles embedded throughout.
1911- Ernest Rutherford- Nuclear model, gold foil experiment, mass of an atom and its
positively charged particles were in the nucleus, with low mass negatively charged
particles surrounding it.
1913- Henry Moseley- discovered the number of protons that are unique to each
element and arranged the periodic table.
1913- Niels Bohr- Bohr model, electrons are negative particles that travel in orbits
around the nucleus that are made of positive protons and neutro - answerTimeline of
the discovery of the structure of an atom. Include date, name, and a brief summary of
each discovery or model.
Bohr Model: the electrons travel in fixed orbits around the nucleus.
This subatomic particle is what gives the nucleus an overall positive charge. -
answerProtons
This is the space surrounding the nucleus that has an overall negative charge. -
answerElectron Cloud
This subatomic particle contributes to the overall mass of a atom, but not its charge. -
answerNeutrons
The subatomic particle located in the space surrounding the nucleus. - answerElectrons
The smallest known particles that make up both protons and neutrons. - answerQuarks
Located in the outermost energy level of the electron cloud, with the most energy. -
answerValence electrons
400 BC- Democritus- first to name the atom.
1803- John Dalton- Sphere model, atom is a solid sphere that can't get any smaller.
Elements are made of atoms that have the same mass and compounds are atoms of
different elements combined.
1869- Dmitri Mendeleev- developed the first periodic table, organized by atomic mass.
1904- JJ Thomson- Plum pudding model, the atom is divisible, it is a positively charged
sphere with negative particles embedded throughout.
1911- Ernest Rutherford- Nuclear model, gold foil experiment, mass of an atom and its
positively charged particles were in the nucleus, with low mass negatively charged
particles surrounding it.
1913- Henry Moseley- discovered the number of protons that are unique to each
element and arranged the periodic table.
1913- Niels Bohr- Bohr model, electrons are negative particles that travel in orbits
around the nucleus that are made of positive protons and neutro - answerTimeline of
the discovery of the structure of an atom. Include date, name, and a brief summary of
each discovery or model.
Bohr Model: the electrons travel in fixed orbits around the nucleus.
