the law that states that a chemical compound always contains the same elements in exactly the same proportions by weight or mass
What is the law of definite proportions
100
subatomic particle with a negative charge
What is the electron
100
the sum of numbers of protons and neutrons fo the nucleus of an atom
What is the mass number
100
a number that specifies the properties of electrons
What is a quantum number
200
a process in which heat is absorbed from the environment
What is endothermic
200
the theory that all things are made up of atoms
What is atomic theory
200
model of an atom that had negatively charged electrons embedded in a ball of positive charge
What is the plum-pudding model
200
an atom that has the same number of protons as other atoms of the same elmenet but has a different number of neutrons
What is an isotope
200
the principle that states that two particles of a certain class cannot be in the same enery state
What is the Pauli exclusion principle
300
describes a process in which a system releases heat into the environment
What is exothermic
300
created an atomic theory with 5 principles. 3 of which still hold to this day
Who is John Dalton
300
number of protons in a nucleus
What is a proton
300
a region in an atom where there is a high probability of finding electrons
What is an orbital
300
the principle that states that the structure of each successive element is obtained by adding one proton to the nucleus of the atom and one elctron to the lowest-energy orbital that is available
What is the aufbau principle
400
the energy transferred between two objects that are different temperatures
What is heat
400
three most important subatomic particles
What is the neutron, proton, and electron
400
four fundamental forces of nature
What is strong, weak, electromagnetic, and gravitational
400
all of the frequencies or wavelengths of electromagnetic radiation
What is electromagnetic spectrum
400
6.022x10^23
What is the amount of molecules in a mole
500
law that states energy cannot be created or destroyed but can be changed from one form to another
What is the law of conservation of energy
500
experiment performed by J.J Thomson taht proved the existence of the electron