.What was the device used to test the electron to find its charge?
The cathode ray tube
100
What number describes the number of protons in the element?
The Atomic Number
100
This happens when light with a certain frequency shines on a metal causing the emission of electrons.
The photoelectric effect.
100
Who came up with the five rules governing the earliest atomic theory?
John Dalton
100
How many electrons can an "s" orbital hold?
Two
200
What was the scientist's name that discovered the nucleus of the atom?
Rutherford
200
What are atoms of the same element but with different masses called?
Isotopes
200
A ___________ is a particle of electromagnetic radiation having zero mass and carrying a quantum of energy.
Photon.
200
What was the first subatomic particle discovered?
The Electron
200
How many electrons can a "p" orbitial hold?
Eight
300
What was the famous experiment used to discover the atomic nuclues?
The Gold Foil Experiment
300
What does the mass number tell us?
Protons and Neutrons
300
Who theorized that the electron of the hydrogen atom can exist in allowed paths or orbits?
Neils Bohr
300
What is the atom made up of mostly?
empty space
300
What principle states that an electron always occupies the lowest-energy level orbital that can receive it?
The Aufbau Principle
400
Who was the scientist credited with finding the charge to mass ratio of the electron using the Oil Drop Experiment?
Robert A. Millikan
400
How many particles are in one mole?
6.02 x 10^23 particles
400
Who used the hypothesis that electrons have both wave and particle properties?
Austrian physicist Ernest Schrodinger.
400
What is the name of the atomic model proposed by JJ Thompson?
Plum Pudding Model
400
What principle states; no two electrons in the same atom can have the same set of four quantum numbers?
Pauli exclusion principle
500
What is the force responsible for holding the nucleus together even though it is comprised of only positive charges?
Nuclear Forces
500
What is one amu (atomic mass unit)?Exactly
1/12th the mass of the carbon-12 atom.
500
What are the two possible quantum numbers denoting an electrons spin? (Spin Quantum Number)
+1/2 and -1/2
500
This law states that a chemical compound contains the same elements in exactly the same proportions by mass regardless of the size of the sample of the compound.
The Law of Definite Proportions
500
According to this rule, orbitals of equal energy are each occupied by one electron before any orbital is occupied by a second electron, and all electrons in singly occupied orbitals must have the same spin state.