Parts of the Atom
This subatomic particle defines the identity of an atom.
What is a proton?
This term comes from the Ancient Greek words meaning "unbreakable".
What is "atom"?
The coining of the term "atom" is attributed to this philosopher.
Who is Democritus?
This is a method of accurately representing experimental evidence about atoms in the simplest way possible.
What is an atomic model?
All atoms of this element have only 2 protons.
What is helium?
This subatomic particle defines the ionic character of an atom.
What is an electron?
Atoms were believed to be indestructible and this shape.
What is a sphere?
This atomic model was based on the laws of conservation of mass, definite proportions, and multiple proportions.
What is Dalton's atomic model?
This corresponds to the number of protons in an atom.
What is the atomic number?
Atoms of this radioactive isotope have 6 protons and 8 neutrons.
What is carbon-14?
This is the collective structure that represents the (majority of) mass of an atom.
What is the atomic nucleus?
This technology helped disprove the theory that atoms were indestructible, and was later used as a global form of entertainment.
What are cathode ray tubes?
This atomic model features electrons suspended in a "uniform lump of positive charge".
What is the plum pudding model?
These particles have a negative charge and were wrongly believed to be "rays". There is a hypothesis that there is only one of them in the entire universe.
What are electrons?
An atom of potassium-40 has this many neutrons.
What is 21?
This subatomic particle defines the isotope of an atom.
What is a neutron?
This material helped James Chadwick discover the existence of neutrons.
What is paraffin wax?
This atomic model was proposed after researchers shot a bunch of alpha particles at gold foil.
What is the nuclear model?
This law can be summarized by the statement "Matter is neither created nor destroyed in a chemical reaction."
What is the Law of Conservation of Mass?
This is the mass number of a mercury isotope with 121 neutrons.
What is 201?
These are regions of space that are typically populated by electrons.
What are electron energy levels?
This subatomic structure, when "struck" by alpha particles, caused them to ricochet "as if you had fired a 15-inch [artillery] shell at a piece of tissue paper and it came back and hit you."
What is the nucleus?
This atomic model is based on an understanding of how electromagnetic radiation influences matter.
What is the quantum mechanical model?
This corresponds to the number of protons + neutrons in an atom.
What is the Mass Number?
This is the isotope of uranium that plutonium-242 decays into after emitting an alpha particle (a.k.a. a helium nucleus).
What is uranium-238?