Atomic Models & Structure
Dalton’s model described the atom as this type of structure.
What is a solid sphere?
The three main subatomic particles are ____, ____, and ____.
What are protons, neutrons, and electrons?
The first person to use the term “atomos.”
Who is Democritus?
Elements in the same column of the periodic table are called ____.
What are groups or families?
Bohr’s model introduced this new concept about electrons.
What are energy levels or shells?
This subatomic particle has a positive charge.
What is a proton?
This scientist discovered the electron using the cathode ray tube.
Who is J. J. Thomson?
This family includes highly reactive metals in Group 1.
What are the alkali metals?
The modern atomic model shows electrons moving in these regions instead of fixed paths.
What are orbitals or an electron cloud?
The atomic number tells you the number of ____.
What are protons?
This experiment led to the discovery of the nucleus.
What is Rutherford’s Gold Foil Experiment?
These nonmetals are found in Group 17 and are very reactive.
What are the halogens?
This model best explains why electrons stay near the nucleus due to opposite charges.
What is the Bohr model?
An isotope has a different number of these particles.
What are neutrons?
This scientist proposed quantized energy levels for electrons.
Who is Bohr?
This group is stable and nonreactive.
What are the noble gases?
Arrange the models from simplest to most modern: Dalton, Rutherford, Bohr, Quantum.
What is Dalton → Rutherford → Bohr → Quantum?
An ion forms when an atom gains or loses these particles.
What are electrons?
The modern model of the atom is based on this branch of science.
What is quantum mechanics?
Elements in the same family have similar chemical properties because they have the same number of these.
What are valence electrons?