Chemistry Semester 1 Unit 2- Atomic Structure
the basic units of matter and the defining structure of elements. made up of three particles: protons, neutrons and electrons.
thing that is composed of two or more separate elements; a mixture.
are particles much smaller than atoms
is a subatomic particle, symbol p or p+, with a positive electric charge of +1e elementary charge and mass slightly less than that of a neutron
a subatomic particle, symbol n or n0, with no net electric charge and a mass slightly larger than that of a proton.
a subatomic particle, symbol e− or β−, with a negative elementary electric charge
the small, dense region consisting of protons and neutrons at the center of an atom.
the number of protons found in the nucleus of an atom of that element, and therefore identical to the charge number of the nucleus.
Average atomic mass
The sum of the masses of its isotopes each multiply by its natural abundance
The total number of protons and neutrons in the nucleus
Each of two or more forms of the same element that contains equal numbers of protons but different number of neutrons in the nucleus
An object that does not have a positive or negative charge
A theory is it well-established explanation for scientific data series typically cannot be proven but they can be established if they are tested by several different scientific investigators . theory can be disproven by a single contrary results
What is one way to Dalton’s atomic theory was incorrect
Atoms are indivisible/indestructible
Big Bang theory
Birth of the universe, from the observed expansion of the universe, cosmic background radiation, abundance of elements, the laws of physics
Description, supporting evidence, experiments of Dalton’s atomic model
Chemical compounds, experiment on mixture of gases, all matter is made of Adams
Description of supporting evidence and experiments of Thompson’s atomic model
Catherine arete experiment, negatively charged particles
Description of supporting evidence of experiments of Rutherford’s atomic model
Gold foil experiment, splitting the Atom
Major findings of Dalton’s atomic model
Elements are made of extremely small particles called Atoms, atoms cannot be created or destroyed
Major findings of Thompson’s atomic model
He discovered the electron a subatomic particle
Major findings of Rutherford’s atomic model
Location = outside, charge= -1 mass equals 1/840900
Location = nucleus, charge equals one, mass equals one
Location = protons in the nucleus, charge= o mass= one
solid with protons and neutrons in the center and outer electrons
positive nucleus outer electrons