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In 1911, the scientist Ernest Rutherford directed a beam of alpha particles (each one equivalent to a helium nucleus, with 2 protons and 2 neutrons) at a thin sheet of gold foil - many of the alpha particles (with a charge of +2) were deflected straight back, repelled by the positively charged atomic nuclei within the gold foil. This provided experimental evidence for the existence of the nucleus for the first time.
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What evidence led Dalton to propose his atomic theory?
There was no concrete evidence that led Dalton to propose his atomic theory. He proposed this theory based on logical explanations about the behavior of elements, gases or materials.
What did Albert Einstein contribute to the atomic theory?
Albert Einstein was the first person to ever be able to show a way to prove the existence of atoms. He did this by using a simple microscope.
Rutherford's gold foil experiment provided evidence for what?
In 1911, Rutherford decided to experiment using what was the current theory of atomic structure at the time. Based on his results, he proposed a new theory; that the majority of the atom is empty space, and that all of the positive and most of the mass are contained in a small central region within the atom, which became later known as the nucleus.
How do you tell the number of neutrons?
To identify neutrons,first,we need to find the atomic number and the atomic weight.Since nuetrons are the negative ones, we need to subtract the atomic weight and the atomic number.For example an oxegen,let we say it is in its circle form.The the positive ones are the protons and the electrons are in the outside part.After we subtract the atomic weight and atomic number we could get the neutrons.
Why it take so long for the atomic model to evolve?
The atom was not often studied until the late 1900's because the church punished those who did and tried erase all evidence of the studies of science in the Middle ages.
What gives you the atomic number?
The total of number of protons in the nucleas gives you the atomic number.
Who provided evidence for the exsitist of an atomic nucleus?
This is the well known gold foil experiment: alpha particles are scattered by the atomic nucleus.
Who discovered the existence of the atomic necleus?
Ernest Rutherford
Who is credited with the development of the the atomic theory?
John Dalton first pursued research into atomic theory. He was the first person to propose the existence of the atomic structure.
Who credited. with the development of the atomic theory?
John Dalton first pursued research into atomic theory. He was the first person to propose the existence of the atomic structure.
What is the nuclear symbol for oxygen-16?
The chemical symbol for Oxygen is O2. It is the 8'th element in the periodic table (having 8 protons in its nucleas and 8 electrons surrounding it), therefore, atomic #8, and has an atomic weight of 16 due to the presence of 8 neutrons in the nucleas (electrons are presumed to weigh nothing, while protons and neutrons are given equal value). This will do for basic chemistry, at least.
Which British physicist discovered the existence of atomic nuclei?
Ernest Rutherford
What evidence is there that the atomic bomb on Japan was an experiment?
There is no evidence, the bomb was dropped as a war weapon.
Can the number of neutrons in the nucleas be calculated by subracting the atomic number from the mass number?
Yes. Although the mass number listed in period tables is the weighted average of all the isotopes of that element.
The atomic number equals?
The atomic number is the number of protons in the nucleus of the atoms of a given number. The elements are arranged in increasing order of atomic number on the periodic table. In a neutral atom, the number of electrons is equal to the number of protons, however, the number of electrons is not the atomic number of an element.
Who provided atomic number of atoms?
The number of protons
From gaps in his table mendeleev predicted the existence of several elements and their?
Atomic numbers.
