M3 Flashcards
subatomic particles
protons
electrons
neutrons
Greek Philosophers hypothesized about the composition of
matter
early days of the atomic theory
when does early days of the atomic theory happened
5th century BC
who says “Everything is made up of small
indivisible particles known as ‘atomos’.”
Democritus
accordin to Democritus: Everything is made up of small indivisible particles known as
atomos
teacher of democritus
Leucippus
Pioneer of the ideas of composition and change in matter
Leucippus
Matter is composed of atomos and void
atomism
in atomism, Matter is composed of
atomos and void
The atomos may combine to form clusters in the void
atomism
Change can happen when some atoms collide with each other in the void.
atomism
e thought the the idea of
the atom goes against ex nihilo and it limits the power of the gods
aristotle
who says matter is based from nature elements
aristotle
what are the nature elements says by aristotle
- fire
- earth
- water
- air
expressed the
existence of the aether
aristotle
The idea of the atom was given importance during the
renaissance
formulated his Atomic Theory based on the
atomos.
john dalton
the first to suggest the
concept of the atom.
Ancient Greek philosophers
the first Greek scholars
who believed in atomism and pioneered the study of the composition of and changes in matter
democritus and leucippus
According to atomism, nature is composed of two basic principles
atom and void
The idea of atomism was set aside because of the ideas of prominent natural philosophers like
plato about nature elements
characteristics of The Atomos of Democritus
● solid
● indestructible
● collides with each other
● can form clusters
Modification of Democritus’ Atomic Model
● There are smaller subatomic particles.
● Two types of the smaller particles are charged.
● Two types of the smaller particles are found at the center.
● The particles are very small and the atom is mostly space.
positively charged and found at the nucleus.
Discovered by Ernest Rutherford
proton
proton discovered by
Ernest Rutherford.
neutral and found at the nucleus. Discovered by
James Chadwick.
neutrons
neutrons discovered by
James Chadwick.
negatively charged and move around the
nucleus. Discovered by JJ Thomson.
electrons
electrons are discovered by
JJ Thomson.
characteristics of Dalton’s Solid Sphere Model
● The atom is indestructible.
● The atom is a solid particle.
● Atoms of the same element have the same properties.
● The atom can combine to form compounds.
characteristics of Thomson’s Plum Pudding Model
● The atom is divisible into charged particles.
● The atom is made of a massive mass with a positive
charge.
● Electrons are negatively charged particles that are
embedded on the body of the atom.
characteristics of Rutherford’s Nuclear Model
● The atom is composed of positive and negatively charged
particles.
● The nucleus is at the center of the atom and this is where
the mass of the atom is concentrated.
● Protons are the positively charged particles and are found
at the nucleus.
● Electrons are the smaller negatively charged particles and
they move around the nucleus.
● The atom is made up of mostly space.
The development of the atomic structure started with the
idea presented by Democritus that all matter is made up
of small indivisible particles called atomos. This idea is
widely known in ancient Greece as
atomism
more precise description of the atom was presented by John Dalton later on. In his
solid sphere model,
THE ATOMIC MODELS
● Dalton’s Solid Sphere Model
● Thomson’s Plum Pudding Model
● Rutherford’s Nuclear Model
