atoms study guide

It is the smallest component of an element that still has the properties of that element. Atoms are made of three particles. protons, neutrons, and electrons
2nd person to do atomictheory he discovered that:
All matter is made out of atoms
atoms cannot be created or destroyed
compounds are formed by 2 or more atoms combined
Atomic model 1st
the 3rd to do atomictheory he discovered
-atoms overall are neutral
-atoms must have an equal amount of positive and negative charge.
experiment –
discover of the experiment: negatively-charge (electrons charged particles)
atomic model 2nd
The 4th/ experiment gold foil
the outcome: Alpha particles (positively charged particle that consists of two protons and two neutrons bound together.) passed straight through , but many were changed.
Main discovery : atomic nucleus
atomic model 3rd
negative charge
positive charge
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no charge
the center where neutrons and protons
the 5th/ discovered the energy levels electrons are separated and that the electrons revolve in stable orbits around the atomic nucleus but can jump from one energy level (or orbit) to another.
atomic model 4th
De Broglie
moving particles like electrons have a wave like properties
the 6th/ discovered that its impossible to determine simultaneously both the location and speed of an electron
the 7th developed mathematical equations to describe e- movement
– father of quantum mechanics
-work lead to electron cloud model and later quantum model
atomic model 5th
dalton's atomic theory
dalton’s atomic theory
1)all matter is composed of an atom
2.) atoms cannot be created or destroyed
3.) chemical reactions occur when atoms are rearranged
4.) compound are formed by the combination of 2 or more different kinds of atoms
atomic structure
atomic structure
(positive charge)protons = 1
(neutral charge) neutron =1
(negative charge) electron = 1/1832
atomic number
always the same as the number of protons
atomic mass
adding the protons and neutrons
the difference between atomic mass and average atomic mass
Atomic mass is the average mass of all the isotopes of a certain type.Mass number is the number of protons and neutrons in an atom, and it tells us about the mass of the atom
equal numbers of protons but different numbers of neutrons. the relationship between isotopes and atomic mass is Each isotope of a given element has the same atomic number but a different mass number (A), which is the sum of the numbers of protons and neutrons.