History of the Atom
Many ancient Greeks believed matter was made of these 4 elements.
What is water, earth, fire, and air?
Who is Niels Bohr?
Rutherford's experiment showed in his model that the nucleus of an atom had this charge.
What is positive?
This particle is negatively charged and 1/2000th the mass of a nuclear particle.
What is an electron?
Number of neutrons in 32He.
What is one?
This ancient Greek was one of the first to propose matter was made of "atomos" or atoms.
Who is Democtitus?
J.J. Thomson discovered the electron by using this apparatus.
The quantum model says that electron positions cannot be determined, but rather occupy this.
What is probability clouds?
This particle is neither positive nor negative and resides in the nucleus.
What is a neutron?
Number of protons in Sodium-23.
What is 11?
John Dalton thought of atoms as small spheres that were ____________.
What is indivisible, uncuttable, or indestructible?
This scientist showed that the same materials were always made of the same atoms in the same proportions.
Who is John Dalton?
This model showed electrons orbiting the nucleus in near circular orbits, much like planets orbiting the sun.
What is the planetary model?
This number of this particle is responsible for the identity of an element.
What is a proton?
Name of an atom with 7 protons, 8 neutrons, and 7 electrons.
What is Nitrogen?
At one point, atoms were thought to be blobs of positive matter with small ________ embedded inside.
This scientist used a beam of alpha particles and gold foil to show the atom was mostly empty space with a dense nucleus.
Who is Ernest Rutherford?
J.J. Thomson's model is affectionately known as this.
What is the "plum pudding model"?
An atom with a net electric charge.
What is an ion?
This ion, with a charge of -1, has 18 electrons.
What is chlorine?
Now, we think of atoms as a cloud of electrons with a dense ________ in the middle.
What is a nucleus?
The work of many scientists, including this scientist, gave us the current quantum model of the atom.
Who is Erwin Schrodinger?
Electron energy orbitals are _________, meaning discrete or chunked, like the keys on a piano.
What is quantized?
One of multiple atoms with the same number of protons but different number of neutrons.
What is an isotope?
This number refers to the weighted average atomic mass of all naturally occurring isotopes of an element.
What is atomic weight?