Page 196 - Science Course 1 (Book 1)

Mo6-L1c: How was The Atomic Model Developed?

Key Concept Protons are made of two up quarks and one down
quark.
How was The Atomic Model Developed?
Neutrons are made of two down quarks and one
How has the model of the atom changed over up quark.
time?
The current atomic model might change with the
invention of new technology that aids the
discovery of new information.
Proton Neutron

u d

d d
u u

SUMMARY
How was The Atomic Model Developed?
In the modern atomic model, electrons form
an electron cloud.

Clouds indicates
where electrons Nucleus
are likely to
be found

Quarks Electron Cloud Model

Protons and neutrons are made of smaller particles
called quarks.

Scientists theorize that there are six types of quarks:
up, down, charm, strange, top, and bottom.
Down
d

Up u s Strange

QUARKS

Bottom b c Charm
t

Top
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