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 When a gold sheet is bombarded by a beam of α-particles, only a few of them get deflected, whereas most go straight, undeflected. This is because

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Important Questions on Structure of Atom

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Chemistry>Physical Chemistry>Structure of Atom>Atomic Models
An element with mass number 181 contains 32% more neutrons as compared to protons. What is the symbol of that element?
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Chemistry>Physical Chemistry>Structure of Atom>Atomic Models
Which of the following is the correct unit of angular momentum of an electron in an orbital of an atom ?
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Chemistry>Physical Chemistry>Structure of Atom>Atomic Models
The number of protons, neutrons and electrons in 71175Lu, respectively, are
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Chemistry>Physical Chemistry>Structure of Atom>Atomic Models
The product obtained after a positron emission from Ga6831 is
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Chemistry>Physical Chemistry>Structure of Atom>Atomic Models
The correct increasing order of the electronegativity is
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Chemistry>Physical Chemistry>Structure of Atom>Atomic Models
Isotopes are
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Chemistry>Physical Chemistry>Structure of Atom>Atomic Models
Hydrogen has three isotopes A, B and C. If the number of neutron(s) in A, B and C respectively, are x, y and z, the sum of x, y and z is
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Chemistry>Physical Chemistry>Structure of Atom>Atomic Models
The statement related to law of definite proportions is
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Chemistry>Physical Chemistry>Structure of Atom>Atomic Models
The sum of the total number of neutrons present in protium, deuterium and tritium is
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Chemistry>Physical Chemistry>Structure of Atom>Atomic Models

 Write the name of particle present at the center of electrons in represented Rutherford's model. Write one characteristic of this model.

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Chemistry>Physical Chemistry>Structure of Atom>Atomic Models
A particular station of All India Radio, New Delhi, broadcasts on a frequency of 1,368 kHz (kilo Hertz). The wavelength of the electromagnetic radiation emitted by the transmitter is [speed of light, c=3.0×108 ms-1]
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Chemistry>Physical Chemistry>Structure of Atom>Atomic Models
If the Thomson model of the atom was correct, then the result of Rutherford's gold foil experiment would have been:
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Chemistry>Physical Chemistry>Structure of Atom>Atomic Models
Which of the following is an example of Law of multiple proportion?
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Chemistry>Physical Chemistry>Structure of Atom>Atomic Models
In the nuclear reaction Al2713+He42⟶X3014+H11,X is
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Chemistry>Physical Chemistry>Structure of Atom>Atomic Models
Among the following pairs of compounds, the one that does not illustrate the law of multiple proportions, is
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The ratio of the highest to the lowest wavelength of Lyman series is
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Chemistry>Physical Chemistry>Structure of Atom>Atomic Models

Select the correct statements from the following :

A. Atoms of all elements are composed of two fundamental particles.
B. The mass of the electron is 9.10939 × 10-31 kg.
C. All the isotopes of a given element show same chemical properties.
D. Protons and electrons are collectively known as nucleons.
E. Dalton's atomic theory, regarded the atom as an ultimate particle of matter.

Choose the correct answer from the options given below:

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Chemistry>Physical Chemistry>Structure of Atom>Atomic Models

Write the name of the particle present in the sphere of represented Thomson atomic model. Explain the model with one example.

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Chemistry>Physical Chemistry>Structure of Atom>Atomic Models
The relation between the stopping potential V0 and frequency v is correctly represented in [ϕ= Work function]
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Chemistry>Physical Chemistry>Structure of Atom>Atomic Models
Which of the following conclusions could not be derived from Rutherford's α-particle scattering experiment: