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发布时间：2022-04-23 03:32
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热心网友
时间：2022-05-03 06:16
In the late 19th century, radioactive elements were found one by one, the fact that they broke the atomic fission is no longer the traditional concept of points. Thomson in 1897, British scientists have found that the original house with negatively charged electron. All this inspired scientists to explore the internal structure of atoms.
1904, British scientists first proposed raisin bread Thomson atomic model. He believes that since the electronics so small and so light, so some positively charged atoms filled the entire atom, and a small very light electronic immersed in positively charged atmosphere, which like raisins as embedded in bread. Electronic belt atom with negative charge was partially offset by positively charged, so the atom is neutral. Thomson's atomic model to explain the atom is neutral, but also an estimated radius about atomic 100pm (10-10m), so it popular for more than 10 years after the accidental Thomson Rutherford overthrow students.
In 1911, Rutherford and Geiger with α-particle bombardment of metal foil, and screen records particle scattering phenomena. He found that the majority of α-particles by a straight line through the metal foil, only a very small part of α-particles was a great bounce back or deflection angle. This experiment fully explained, there are a lot of room for atoms, while the positive charge on the atomic center part of a very small ball inside the body, here accounting for atomic mass of 99%. Therefore, he concluded that Thomson's raisin bread model of the atom does not match reality, the same time, he acted decisively in proposing the new atomic model.
In 1912, Rutherford Contact solar system planets revolving around the sun to make the new model is a positively charged atomic nuclei in the atoms of the middle, accounting for the vast majority of atomic mass, just as the sun as the solar system; negatively charged nucleus surrounded by an electronic for high-speed movement. The model can be estimated by atomic diameter is 100pm, electronic diameter is 1fm, the nucleus diameter is 10 ~ 0.1fm, there are a lot of room for atoms.
In 1913, Rutherford's students, the Danish physicist Niels Bohr will be born near the quantum theory of atomic structure model applied to, and put forward: E may in some specific orbit around the core for circular motion, the farther away from the nuclear energy higher; possible orbital angular momentum by the electron must be several times the entire h/2π decisions; when the electronic potential in these tracks campaign does not launch atomic energy absorption not only when the electronic transitions from one track to another track when it fired or atomic energy absorption and emission or absorption of radiation is the single-frequency, radiation frequency and the relationship between energy E = hν is given by. Bohr therefore items won the 1922 Nobel Prize in Physics.
Bohr developed his teacher Rutherford's theory, but he is still not completely shake off the effects of traditional theory. In his theory, sometimes the use of new theoretical methods, and sometimes use the traditional theory, which he atomic structure, particle movement of the explanation, there are still many places where self-contradictory.
热心网友
时间：2022-05-03 07:34
In the late 19th century, radioactive elements were found one by one, the fact that they broke the atomic fission is no longer the traditional concept of points. Thomson in 1897, British scientists have found that the original house with negatively charged electron. All this inspired scientists to explore the internal structure of atoms.
1904, British scientists first proposed raisin bread Thomson atomic model. He believes that since the electronics so small and so light, so some positively charged atoms filled the entire atom, and a small very light electronic immersed in positively charged atmosphere, which like raisins as embedded in bread. Electronic belt atom with negative charge was partially offset by positively charged, so the atom is neutral. Thomson's atomic model to explain the atom is neutral, but also an estimated radius about atomic 100pm (10-10m), so it popular for more than 10 years after the accidental Thomson Rutherford overthrow students.
In 1911, Rutherford and Geiger with α-particle bombardment of metal foil, and screen records particle scattering phenomena. He found that the majority of α-particles by a straight line through the metal foil, only a very small part of α-particles was a great bounce back or deflection angle. This experiment fully explained, there are a lot of room for atoms, while the positive charge on the atomic center part of a very small ball inside the body, here accounting for atomic mass of 99%. Therefore, he concluded that Thomson's raisin bread model of the atom does not match reality, the same time, he acted decisively in proposing the new atomic model.
In 1912, Rutherford Contact solar system planets revolving around the sun to make the new model is a positively charged atomic nuclei in the atoms of the middle, accounting for the vast majority of atomic mass, just as the sun as the solar system; negatively charged nucleus surrounded by an electronic for high-speed movement. The model can be estimated by atomic diameter is 100pm, electronic diameter is 1fm, the nucleus diameter is 10 ~ 0.1fm, there are a lot of room for atoms.
In 1913, Rutherford's students, the Danish physicist Niels Bohr will be born near the quantum theory of atomic structure model applied to, and put forward: E may in some specific orbit around the core for circular motion, the farther away from the nuclear energy higher; possible orbital angular momentum by the electron must be several times the entire h/2π decisions; when the electronic potential in these tracks campaign does not launch atomic energy absorption not only when the electronic transitions from one track to another track when it fired or atomic energy absorption and emission or absorption of radiation is the single-frequency, radiation frequency and the relationship between energy E = hν is given by. Bohr therefore items won the 1922 Nobel Prize in Physics.
Bohr developed his teacher Rutherford's theory, but he is still not completely shake off the effects of traditional theory. In his theory, sometimes the use of new theoretical methods, and sometimes use the traditional theory, which he atomic structure, particle movement of the explanation, there are still many places where self-contradictory.
热心网友
时间：2022-05-03 09:09
In 19 century's ends, the radioactive element was discovered one by one that, their fission fact breaks through the traditional ideas which the atom cannot again divide.In 1897 English scientist Thomsen discovered in the atom has the belt negative charge electron.All these were driving the scientists explore atomic the intrinsic structure.
In 1904, English scientist Thomsen first proposed the raisin bread atomic model.He thought since the electron is so small, also that light, therefore the original innertube positive electricity part floods the entire atom, but the very small very light electronic immersion in the positive electricity atmosphere, this direct positive raisin inlays in the bread such.Electricity innertube negative charge by atomic inner tube positive charge part counterbalance, therefore the atom is electric neutrality.Thomsen's atomic model can explain the atom is electric neutrality, but also can estimate the atomic radius is approximately 100pm(10-10m), therefore it is in fashion for more than 10 years, later the accident is overthrown by Thomsen's student Rutherford.
In 1911, Rutherford and the geiger with alpha the granule bombardment metallic foil, and used the fluorescent screen record granule scattering phenomenon the situation.He discovers the majority of alpha granules according to the straight line penetration metallic foil, only then the extremely few part of alpha granules come back by the resilience or the deflection very great angle.This experiment showed fully intratomic has the very big space, but the positive charge part concentrates in the atomic center minimum spheroid, here occupies the atomic mass above 99%.Therefore, he concluded Thomsen's raisin bread atomic model symbol reality, simultaneously he decisively does not propose the new atomic model. In 1912, Rutherford related in solar system the planet to circle the solar revolving situation to propose the new atomic model was the belt positive electricity atomic nucleus center the atom, occupied the atomic mass the major part, in direct positive solar system solar such; The belt negative electricity electronic encirclement atomic nucleus makes the high speed movement.According to this model may estimate the atomic diameter is 100pm, the electronic diameter is 1fm, the nuclear diameter is 10~0.1fm, the atomic interior has the very big space.
In 1913, Rutherford's student, Danish physicist Bohr will be born the soon quantum theory to utilize in the atomic structure model, proposed: The electron to circle the nucleus on some specific possible tracks to make the circular motion, is higher to a nucleus farther energy; The possible track by the electronic angular momentum to have to be h/2π integral multiple decision; When electron when these possible tracks movement the atom does not launch also the nonabsorbing energy, only then when the electron jumps from a track to another track the atom only then launches or the absorbed energy, moreover launches or the absorption radiation is monofrequent, between the radiation frequency and the energy relates by E=hν gives.Therefore Bohr an achievement has had the honor to receive in 1922 the Nobel physics prize.
Bohr has developed his Mr./Mrs. Rutherford's theory, but he still does not have to get rid of the traditional theory completely the influence.In his theory, utilizes the new theory method from time to time, from time to time utilizes traditional the theory, this causes him regarding the atomic structure, the granule law of motion explanation also to have many self-contradictory places.
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热心网友
时间：2022-05-03 11:00
热心网友
时间：2022-05-03 13:08
ccording
to
the
Carnegie.
Mailun
university
research,
the
use
of
the
Internet
may
lead
to
decreased
level
of
mental
health,
two
studies
show
that
the
number
of
Internet
and
more
people
with
fewer
people
than
the
Internet
even
if
only
a
few
hours
a
week
will
always
feel
the
loneliness
and
Ju
Sang,
This
is
not
to
say
feelings
of
the
people
will
not
spend
more
time
online,
but
said
the
use
of
the
Internet
seems
to
lead
people
feel
really
bad,
the
researchers
puzzled
by
these
results,
because
it
is
expected
of
them
diametrically
opposed,
they
forecast
,
And
watching
television
than
from
the
social
point
of
view,
the
Internet
may
be
more
healthy,
because
networks
allow
users
to
choose
their
own
need
for
the
information
and
conct
exchanges
with
others
