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Discovering Parts of Atoms - Coggle Diagram
Discovering Parts of Atoms
Early Ideas about Matter (1)
many years ago, people also had questions about the smallest things
Democritus
He said that there are small hard things call atoms that make up things and cannot be divided
Atoms always move
Astridotle
Believed that everything is made up of fire, water, air, and earth
Didn't believe in the space in between the things
Dalton's Atomic Model (2)
he measured chemical reactions
Returned to Democritus's ideas
Atoms are identical when they are in the same thing
The Atom (2)
An atom is the smallest piece of an element that still represents that element.
The size of atoms
they come in different sizes, and you can fit about 7.5 trillion carbon atoms into a period.
Seeing Atoms
an STM can use metal to make a tiny picture of an atom
Cannot see inside atoms
Thomas- Discovering Electrons (3)
some lit up things consist of his discoverings which are cathode ray tubes (air and electricity)
Negative Particles
the negative and positive rays bent close and far from each other
negative + positive plate on other ends
Parts of Atoms
the masses were similar
An electron is a particle with one negative charge (1-)
Thomson's Atomic Model
Thomoson said that atoms were positive with negative charges within
Rutherford - Discovering the Nucleus (4)
him and his students
Rutherford's Predicted Result
alpha particles were dense and large, so they would push around the loose atoms
The Gold Foil Experiment
Put the alpha particle near the gold foil with a screen that lit up because of the striking of the particles
The Surprising Result
some of the particles bounced back, so believed that something in nucleus was hard/dense
Rutherford's Atomic Model
atoms are mostly empty space
most of an atom's mass and positive charge is concentrated in a small area in the center of the atom called the nucleus.
A proton is an atomic particle that has one positive charge (1t).
Discovering Neutrons (5)
A neutron is a neutral particle that exists in the
nucleus of an atom.
Bohr's Atomic Model (6)
the different things change the color of fire
Electrons in the Bohr Model
move closer to nucleus when less energy and vice verse
what releases t light
Limitations of the Bohr Model
only worked with atoms with electrons
The Modern Atom Model (7)
An electron cloud is an area around an atomic nucleus where an electron is most likely to be located.
can only predict the likeliness (denser means more likely)
Quarks (8)
neutrons and electrons are mad up of smaller parts called quarks
6 different quark names: up, down, charm, strange, top, bottom
made up of different combinations of quarks